Showing papers by "Nankai University published in 1979"

Stepless transmission device for a bicycle

Abstract: A stepless transmission device for a bicycle which has sufficient durability and smooth operation characteristics for practical use is provided. The transmission device can steplessly change the rotational ratio of a wheel to a drive sprocket by changing the oscillation angle of rachet arms which are radially disposed on the periphery of a disk fixed to a shaft for said sprocket. The transmission device is characterized in that said rachet arms incorporated with respective crank arms are pivoted to said sprocket in positions equally distributed on a coaxial circle, and one end of each crank arm constitutes a guide pin, said guide pin being engaged in an annular groove which is coaxially provided in a rotatable bearing race the eccentricity of which can be changed.

New species of harpactorinae from china ii(hemiptera: reduviidae)

Abstract: The present paper deals with 14 genera and 32 species of Chinese Reduviidaebelonging to the subfamily Harpactorinae Six genera, 18 species and 2 subspecies are described as new to science and threespecies are recorded for the first time from China Cydnocoris gilvus Burmeister (n rec) Kwangsi, Yunan Cydnocoris hyalinus Miller (n rec) Yunnan Cydnocoris binotatus, sp nov Length 157mm Clothed with white short hairs Dorsum red, posterior lobe ofpronotum with two black spots, femora black, head beneath red, scutellum entirely red,venter with a black transverse band on each sternum (sometimes broken at middle) Allied to C tabularis Distant and C russatus Stal but abdomen less explanate andwith different black markings Type , Guangdong (Nankai University) Cydnocoris ventralis, sp nov (fig 28) Allied to C binotatus, sp nov but pubescence long and yellow, pronotum entirelyred Body beneath black, connexivum and apex of abdomen red Length 177 mm, Type , Yunnan (Institute of Zoology, Academia Sinica) Cydnocoris geniculatus, sp nov (fig 29) Length 14mm, width 32mm Clothed with long yellowish hairs Flavus withblack markings as follows: Transverse sulcus on head, antennae, 3rd rostral segment,anterior angles of pronotum, two spots to posterior pronotal lobe, central round spot toscutellum, apices of femora, tibiae, tarsi, membrane, a transverse spot to each side ofabdominal sternum Antennae with thicker 2nd segment and 3rd very short as in Cfasciatus Reut but coloration very different Type , Yunnan (Tianjin Nat Hist Mus) Serendiba nigrospina, sp nov Light fuscus, clothed with yellowish curved short hairs intermixed with long erecthairs Head above antennae, legs and dorsum of abdomen reddish Several rings on1st antennal segment, base of femora and apex of connexival segments pale Humeralangles, apex of tibiae and tarsi black Differing from S hymenoptera China by smal-ler size, longer humeral angles and different coloration Type , Hainan Is (Tianjin Nat Hist Mus) Villanovanus nigrorufa, sp nov (fig 30) Differing from V dichrous Dist in size and coloration Black, clothed with shortwhite haris Head, anterior lobe and posterior margins of pronotum, scutellum, heme-lytra excepting inner part of corium and membrane, prosternum, anterior coxa, dorsumand apex of abdomen and connexivum red; two rings on 1st antennal segment, middleof 2nd segment, rostrum beneath and anterior femur beneath paler Length 192 mm, width 32 mm Type , Hainan,Is (Tianjin Nat Hist Mus) Serendus, gen nov Elongate, shortly pubescent Head shorter than twice its width Eyes large,rounded and projecting laterally Antennae long and slender, 1st segment longer thantwice the length of 2nd, post-antennal spines very short First rostral segment aboutas long as 2nd and 3rd taken together Pronotum longer than head, anterior lobeshorter than half the length of posterior lobe, humeral spines arising from above humeral angles and unarmed behind Scutellum rounded laterally, apex broadlyrounded Femora swollen apically, anterior pair longer than anterior tibiae, tarsishort, 3-segmented Hemelytra passing abdomen, costal margin slightly concave, me-mbrane very large, base of outer cell narrower than that of inner cell Type species: Serendus geniculatus, sp nov Allied to Serendiba Stal, but pronotum shorter Differing from VillanovanusDist by different structure of post-antennal spines, humeral spines and scutellum Serendus geniculatus, sp nov (fig 31) Length 170mm, width 28 mm Clothed with short flavus hairs Body above ex-cepting a line between ocellus and antenna pale fuscus; body beneath, rostrum andlegs stramineous Head above, apices of femora, anterior tibiae, basal 2/3 of interme-diate and posterior tibiae reddish Base of 1st antennal segment, humeral spines, baseof connexival segments and round spots to 3rd--5th sterna black Type , Szechuan (Nankai University) Serendus flavonotus, sp nov (fig 32) Length 158 mm, width 24 mm clothed with grayish short hairs Black, a longtu-dinal line be

Some new trematodes of the birds from tianjin,china

Abstract: In examination of the trematoda fauna of birds from Tianjin, China,three newtrematodes were identified, two belonging to family Eumegacetidae and one to Hetero-phyidae. The type and paratype specimens are deposited in the Institute of Zoology,Academia Sinica. 1. Eumegacetes (Anterovitellum) glareolae,sp. nov.(fig. 1) Four specimens were recovered from the small intestine of one of the three swal-low-plovers, Glareola maldivarum Forster on April 28, 1952. This species resembles closely to E. (A.) centropius Jaiswal, 1973 and E. (A.)megacetabulum Jaiswal et Vasudev, 1960 in the position of the genital pore. However,it differs from E. (A.) centropius by the smaller size of the ovary,in having theanterior end of the lateral uterine coil at the level of the testes or slightly forward,and by the larger eggs.It differs from E.(A.) megacetabulum by the size of theacetabulum, with its proportion to the body length being 1:4.5, and the vitelline fol-licles disposed from the posterior border of the pharynx to near the posterior extre-mity of the body. 2. Eumegacetes (Posthovitellum) eurystomi,sp. nov. (fig. 2) Six specimens were obtained in the small intestine of a chinese broad billed roller,Eurystomus orientalis calonyx Sharpe, on June 7,1950. This species is distinguished from all the other described species in the subgenusPosthovitellum Khotenovskii,1966 in the lateral coils of the uterus not extending an-teriorly over the level of the testes. 3. Cercarioides (Cercarioides) orientalis, sp. nov. (fig. 3) Only a single specimen was secured from the rectum of a gray back gull,Lanusschistisagus Stejneger, on July 5,1965. This species differs remarkably from the other two species: Cercarioides (C.)asharonii Witenberg, 1929 and C. (C.) baylisi Gohar, 1930 in having a longer hindbody,the proportion of the forebody to the hindbody being 1:2.6, a prepharynx and largerova.