On neio Urocyclidcey^'QTn British East Africa, 331 



XLT. — New Species of JJi-ocycVidse from British East 

 Africa. By Dr. ('. POLLONEKA. 



[Plate VIII. J 



Urocyclus (Microcyclus^ signatuSj sp. n. 

 (PI. VIII. figs. 1, 2.) 



U. pallide ochraceo-aurantiacus, antice pallidior, castaneo-nigres- 

 ceuti zonatus. Clypeus granulosus, postice rotundatus ; 



foramine palliali amplo ; apcrtura pulmouea leviter post-mediana, 

 pallide marginata ; colore ochraceo-aurantiacus, medio leviter 

 fuscatus et brunneo maculatus, lateraliter bizouatus, zona 

 principalis obscuriore. Dorsum obtuse carinatum, carina ad 

 clypeum fere evauescente, utrinque obscurissime unizonatum et 

 superne lineis plurimis interruptis notatum. Solca pallida, 

 medio pallidiore. 



Longit. dorsi mill. 12| ; clypei 9| ; solese 26. 



Hah. Mt. Kenia, at an altitude of 9000-10,000 feet {Robin 

 Kemp). 



Although both the specimens of this species which I have 

 been able to examine were not quite adult, the reproductive 

 organs, though still very small, were sufficiently developed 

 to give an idea of their structure. 



1 place this species in the subgenus Microcyclus on account 

 of the prostate gland not being of an elongate shape as in 

 typical Urocyclus and in the subgenus Mesocyclus ; at tiie 

 same time this organ is much smaller than is the case with 

 the other species of Microcyclus hitherto described. These 

 intermediate characters, which further lessen the differences 

 between the subgenera Ilesocyclus and Microcyclus, have 

 decided me in regarding the latter group as a subgenus of 

 Urocyclus; moreover, L)r. Simroth *, when creating the 

 genus Microcyclus, stated that it might also be considered 

 a subgenus of Urocyclus. Dr. Kobeltf is mistaken in 

 attributing to me the creation of the genus Microcyclus, 

 which he holds to be a distinct genus, while regarding 

 TricJwtoxon as a simple subgenus of Urocyclus. 1 do not 

 think that this opinion is tenable, as Microcyclus and Uro- 

 cyclus are separated by very slight differences, while Tricho- 

 toxon differs by the absence of the prostate gland and by the 

 proportionately enormous atrium containing several darts. 



* ' Ueber bekannte und neue Urocycliden,' 1896, p. 303. 

 t ' Die MoUusken ausbeute d. Erlaug. Keise iu rsordost-Afrika,' 1909, 

 p. 60. 



