Mexican and Central American Chauliognathinae. 155 



Var. a. The base of the head, a patch on the disc of the pro- 

 thorax, the elytra (the sutural, apical, and lateral margins excepted), 

 the outer half of the femora, the antennae, tibiae, and tarsi infuscate. 



(?•) 



Hab. Mexico, Teapa. 



(J. Aedeagus : median lobe stout, curved, moderately produced 

 at the apex ; left lateral lobe short, broad, compressed, subtruncate 

 at the tip, and armed with a sharp tooth at the upper apical 

 angle ; right lateral lobe (fig. 28a) much longer than the left, the 

 outer portion widened and oblique, the apex sharply hooked at the 

 inner angle and toothed at the outer angle. Plate VII, figs. 28, 28a. 



An immature- looking, elongate insect, testaceous in 

 colour, with the antennae, knees, and tarsi, and sometimes 

 the extreme base of the elytra also (C. oedemeroides), in- 

 fuscate or black. The wings are slightly infuscate. The 

 eyes are very large and prominent in the male, a Httle smaller 

 in the female. The variety is represented by a single 

 female from Teapa. A common insect in Central America, 

 represented by 70 examples in the collections before me. 

 Five males have been dissected, showing no variation in the 

 form of the lateral lobes of the aedeagus : the tooth at the 

 apex of the broadly expanded left lobe (not shown in the 

 figure) can only be seen when the aedeagus is viewed in 

 profile. 



25. Chauliognathus exsanguis. (Plate III, fig. 10, ^, var.) 



Chauliognathus exsanguis, Gorh., Biol. Centr.-Am., Coleopt. 

 iii, 2, p. 74 (part.) {nee p. 279). 



Opaque, testaceous, the antennae, the apices of the femora, 

 the tibiae and tarsi, some markings at the base of the head, an oblong 

 patch on the disc of the prothorax (sometimes divided down the 

 middle, or altogether wanting), and rarely a posteriorly evanescent 

 streak on the basal half of each elytron near the suture) more or 

 less infuscate. Head faintly punctulate, in (^ much narrowed 

 behind and with very prominent eyes, smaller in $ ; antennae in ^ 

 reaching to a little beyond the middle of the elytra, shorter in $, 

 joint 3 about twice as long as 2. Prothorax narrow, oblong, 

 slightly sinuate at the sides posteriorly, broader in $, the margins 

 feebly reflexed. Elytra incompletely covering the abdomen, 

 narrowed posteriorly. Aedeagal cap of o very elongate. 



Var. o. The head between and behind the eyes, entirely or in 



