416 Trans. Acad. Sci. of St. Louis. 



seems to have almost normal maxillary palpi, which may 

 prove that these organs are malformed in the single male be- 

 fore me, for it does not seem possible to assume any specific 

 difference between the assumed male and female described 

 above. I cannot distinguish ^^arci^s Lee, from the subse- 

 quently described brimnescens , and have therefore placed the 

 latter in synonymy. 



Leiolinus n. gen. 



While agreeing closely with HesperoUnus in general struc- 

 ture of the head, antennae and palpi, and especially in 

 possessing the same polished and impunctate convex longi- 

 tudinal line behind each eye, this genus departs in so many 

 characters and particularly in its much larger but even pro- 

 sternum, wholly devoid of any trace of the medial carina so 

 conspicuous in HesperoUnus, that there can be but little 

 doubt of its real generic isolation. The third and fourth 

 palpal joints, in regard to their relative lengths, are nearly as 

 in the preceding genus, but here the fourth joint is inserted 

 more axially and appears to be only feebly oblique ; the 

 frontal and ocular grooves of the head are nearly similar but 

 the antennae are longer, looser and more slender, and the 

 sculpture throughout is very minute and feeble, in marked 

 contrast to HesperoUnus. The head above and beneath is 

 very minutely strigilate in wavy lines, which are partially dis- 

 integrated into fine reticulations; the pronotum is less finely 

 but usually more feebly strigilate in more entire wavy lines, 

 the elytra smooth and polished between the punctures, which 

 are small but strong, evenly though unsystematically distribu- 

 ted and rather close-set and the abdomen is minutely but 

 rather strongly and very closely strigilate in wavy transverse 

 lines, the punctures being very minute, sparse, feeble, evenly 

 distributed and transversely sublineate in form. The gular 

 sutures are arcuate, widely separated anteriorly, but, well 

 before the middle, become extremely approximate and par- 

 allel to the base; they are excessively fine and feeble. In the 

 form of the posterior margin of the prosternum beneath the 

 coxae, LeioUnus stands alone in the tribe as far as I have 



