Mexican and Central American Chauliognathinae. 149 



(J. Aedeagus : median lobe very stout, abruptly curved, slightly 

 produced at the apex ; left lateral lobe very slender, long, sinuate, 

 dilated at the base, feebly hooked at the tip; right lateral lobe 

 short, compressed, slightly hooked at the tip. Plate VI, fig. 21. 



Hab. Panama, Chiriqui; Colombia, Santa Marta {Mus. 

 Brit.). 



Described from three specimens, one, from Bugaba, 

 having the prothorax immaculate, as in a Colombian ex- 

 ample ($) in the British Museum. The pair retained for 

 the " Biologia " collection are very similar, the female 

 simply being broader than the male, and the rather short, 

 stout, filiform antennae do not reach the middle of the 

 elytra in either sex, tapering a little towards the apex in 

 the female. The elytra are parallel and have their sutural 

 and outer margins flavous. The prothorax has two 

 prominent callosities on the disc, separated by a deep 

 groove. C. exiguusis one of the smallest known species of 

 the genus. 



18. CJiauliognathus limbicollis. (Plate III, fig. 9, ^, var. 

 scapularis.) 



Chauliognathus liynhicollis, Lee, Proc. Acad. Phil. 1858 



[1859], p. 71 ; Trans. Am. Ent. Soc. ix, p. 44; Crotch. 



Trans. Am. Ent. Soc. v, p. 78; Gorh., Biol. Centr.-Am., 



Coleopt. iii, 2, p. 283. 

 Chauliognathus opacus, Lee, New Sp. N.-Am. Col. p. 90 



(1865). 

 Chauliognathus hastatus, Gorh., loc, cit. p. 77, pi. 5, fig. 7 



Hab. North America, Southern United States ; Mexico ; 

 Guatemala. 



Var. a. Prothorax opaque, wholly black; elytra with the apical 

 black space extending broadly forward along the suture to the 

 base, and usually widening anteriorly, leaving the sides to beyond 

 the middle to a greater or less extent, and the apical margin, 

 yellow. (cJ$.) 



Hab. Mexico {Mus. Brit., ex coll. Pascoe), MoreUa in 

 Michoacan (Hoge). 



Var. /3. Prothorax shining, ochreous or rufo-testaceous, with two 

 or three transversely placed spots on the disc, which are sometimes 

 confluent, black; elytra black, with a humeral patch or stripe 

 (sometimes reaching to about the middle), and the apical margin 



