380 . HETEROMERA. 
extending northwards to near the Mexican frontier. WV. zonitotdes agrees very néarly 
with Leconte’s description of V. cribricollis (=porosa and fuscipennis, Lec. (Trans. Am. 
Ent. Soc. viii. p. 215), but it has the head black. This species has the head consider- 
ably prolonged in front and very long mandibles, and in this respect (as Leconte 
remarks of W. cribricollis) resembles Gnathium. The colour of the thorax, elytra, and 
legs is variable. The specimens from Coahuila and Guatemala have the elytra more 
closely and less coarsely punctured than in most of those from the intervening localities, 
but they are connected by intermediate forms. The length (with the head fully 
extended) varies from 44-9 millim. Labelled WV. egena, Dej., in Mr. F. Bates’s 
collection. Dr. Horn, Trans. Am. Ent. Soc. xii. p. 108, states that WV. zonitoides, 
Dugés, is most closely related to but distinct from V. sparsa, Lec. 
12. Nemognatha flava. (Tab. XVII. fig. 16.) 
Gnathium flavum, Dugés, An. Mus. Michoacano, ii. p. 107 dis’. 
Hab. Mexico, Jalapa (Flohr}, Hoge); GuaTeMaLa, Coban (Conradt); Costa Rica 
(Van Patten). . 
We have received ten examples of this species—seven from Mexico, two from 
Guatemala, and one from Costa Rica. This insect has the thorax longer than broad, 
considerably narrowed in front, and constricted before the apex, the disc transversely 
depressed anteriorly and with a well-marked median channel, the surface densely and 
finely punctured. The elytra are very densely and finely punctured, with the inter- 
Spaces somewhat granular. The antenne are elongate and filiform, black. The upper 
surface is opaque, flavous or flavo-luteous, and clothed with fine, short, golden pubes- 
cence. The outer lobe of the maxille is longer than the head, the head itself 
prolonged in front, and the mandibles are elongate (as in WV. zonitoides). The legs are 
variable in colour. In two or three examples the head has a narrow transverse space 
between the eyes infuscate. . 
13. Nemognatha atra. 
Gnathium atrum, Dugés, An. Mus. Michoacano, ii. p. 118 bis'. 
Hab. Mexico, Tupataro ! (Saiié). 
M. Sallé has recently forwarded me an example of this species. It is closely allied 
to VV. zonitoides, from which it differs by its entirely black thorax and coarser punctua- 
tion. The thorax is more depressed in front, and the punctuation of the head is 
particularly coarse, —- 
