Mexican and Central American Chauliognathinae. 147 



" Oaxaca," and there are three females in the " Biologia " 

 collection from the same source. C. collaris is larger than 

 C. aterrimus, differing from the similarly coloured form of 

 that species in having the prothorax rounded at the sides 

 posteriorly, very shining, and nigro-bipunctate on the 

 disc ; the antennae extremely elongate, and the eyes more 

 prominent, in the male ; and the abdominal segments very 

 narrowly bordered externally with yellow. The aedeagus 

 is very similarly shaped in the two insects, that of C. 

 collaris having a much longer median lobe and the longer 

 lateral lobe more strongly curved from the abruptly 

 twisted basal portion. The single ($) specimen with pallid 

 elytra (a transverse patch at the base excepted) seems to 

 belong to the same species. 



15. Chauliognathus vestitus, n. sp. 



Black, the abdomen ochreous spotted with black; thickly, the 

 head and prothorax sparsely, clothed with rather long cinereous 

 pubescence, the elytra dull, the rest of the upper surface shining. 

 Head in c^ triangular and with large prominent eyes, smaller in 

 $; antennae long, filiform, joint 3 a little more than half the length 

 of 4. Prothorax subquadrate in J', broader and transverse in $, 

 strongly rounded at the sides anteriorly and with rather prominent 

 hind angles, the margins broadly reflexed, especially in $; the 

 surface uneven, very shining, and almost smooth, the disc foveate 

 in the middle towards the base. Elytra long, broader than the 

 prothorax, gradually narrowed from about the basal fourth. 



(5*. Aedeagus : median lobe long, curved, produced into a spoon- 

 shaped process at the apex; left lateral lobe extremely elongate, 

 sinuate within, and produced at the apex into a long curved hook ; 

 right lateral lobe much shorter than the left, compressed, rounded 

 at the apex. Plate VI, fig. 19. 



Length (excl. head) 10-10| mm. ((? ?.) 



Hab. Mexico {Mus. Oxon.), Oaxaca (Boucard). 



One pair, left undetermined by Gorham, and three 

 others ((^ $) in the Oxford Museum. A wholly black form, 

 the abdomen excepted, with a very shining, almost smooth 

 prothorax, and rather coarse cinereous pubescence, which 

 is sufficiently dense on the elytra to give them a grey 

 appearance. The structure of the aedeagus, too, is char- 

 acteristic. C. vestitus may be placed near C. collaris, the 

 four known specimens of which were obtained by Boucard 

 at the same locaUty. 



