On Crossophorus collaris, Hemprich Sf Ehrenberg. 343 



twice as long as broad and two and a half times as long as 

 the prothorax, parallel-sided in the basal third, then gradually 

 narrowed to the apex, before which there is a shallow con- 

 striction ; the basal margin gently sinuate, with the external 

 angles rounded, the apex truncate; the striae shallow on the 

 disk, but deeper behind and on the inflexed margins, and 

 containing closely set deep punctures; the intervals about as 

 broad as the striae, slightly convex, and with a tew very 

 minute punctures, the junction of intervals 2 and 10 at the 

 apex distinctly swollen. Legs comparatively long and 

 slender ; the femora minutely coriaceous and with very sparse 

 fine punctures throughout ; the tibiae gently sinuate externally, 

 the inner edge deeply bisinuate and armed with strong seti- 

 gerous teeth in the apical half, and the external apical spine 

 long and distinctly curved ; the tarsi unusually long and 

 slender, the second joint of the front pair being nearly twice 

 as long as broad. 



Length 7 mm., breadth 2'2 mm. 



Portuguese E. Africa : Beira, vii. 1903 (P. A. Sheppard). 



Type in the British Museum. 



The slender tarsi and very fine lateral punctation of the 

 prothorax distinguish this insect from all the other species of 

 the genus. 



8. Aorus piceus, Fst. 

 Leptobaris picea, Faust, Stett. ent. Zeit. 1894, pp. 148 & 149. 



Sierra Leone. 



I have not succeeded in identifying this species, which, so 

 far as can be judged from Faust's very brief description, 

 must resemble a dwarfed specimen of A.anthracinus, Brancs. 



XXXV. — Crossophorus collaris, Hemprich & Ehrenberg, a 

 little-known Nematode Parasite of the Hyiax. By H. A. 

 Baylis, M.A. 



(Published by permission of the Trustees of the British Museum.) 



An opportunity having recently occurred of examining 

 specimens of this very curious and highly specialized Ascarid 

 from the hyrax {Procavia sp.), it seems desirable to describe 

 the species in somewhat fuller detail than has hitherto been 

 done. The existing descriptions (Hemprich and Ehrenberg, 



