456 Mr. C. J. Gahan on 



Praogena gagatina, Makl. 



The examples obtained by Col. Yerbury at Aden are of a 

 more intense black colour than those which I have seen from 

 Senegal, but exhibit no structural differences by which they 

 could be regarded as specifically distinct. 



While examining this and various other species of the 

 genus Praogena, 1 have had occasion to observe that the 

 hinder part of the gular surface of the head is furnished with 

 a stridulating area, and I have little doubt that sounds are 

 produced by the friction of this area against the anterior 

 edge of the prosternum when the head is moved backwards 

 and forwards towards the prothorax. As the presence of a 

 stridulating area in this position does not seem to have been 

 previously noticed, I think it worth calling attention to, 

 especially as the character may prove helpful in distinguishing 

 some of the genera of Tenebrionidse. 



Rhipiphorus caffer, Gerst. ? 



The specimens taken by Colonel Yerbury at Aden and 

 Lahej may possibly belong to a distinct species, as I have 

 had no Caffrarian or other examples of R. coffer, Gerst., for 

 comparison. They differ from R. subdipterus, Bosc, by their 

 smaller size and in being more strongly and closely punctured, 

 two characters mentioned by Gerstaecker as distinguishing 

 coffer J Gerst., from suhdipterus, Bosc ; in the females the 

 legs are pitchy black and the abdomen yellowish testaceous, 

 with fuscous patches on the sides ; in the males the legs and 

 abdomen vary in colour, one example having all the legs and 

 the greater part of the ventral side of the abdomen yellowish 

 testaceous, while in a second example the anterior legs and 

 the base of the abdomen only are testaceous; the elytra are 

 in some specimens marked with a fuscous patch at the 

 shoulders, in others they are entirely pale. 



Long. 4-6^ mm. 



Ceroctis Yerhuryij sp. n. 



Niger ; supra dense fortiterque punctatus, vix nitidus ; elytris rufis, 

 fasciis tribus nigris — una inter medium bashique, secunda 

 mediana, tertia inter medium apicemque ; autenuis rufis, articuHs 

 duobus basalibus nigris ; corpore subtus nigro, sparsim cinereo- 

 pubescente. 



Long. 11-13, lat. 3^-4 mm. 



Hah. Aden [Yerbury). 



