_GNATHIUM:: 381 
- GNATHIUM. | 
Gnathium, Kirby, Trans. Linn. Soc. xii. p. 425 (1818) ; Horn, Trans, Am. Ent. Soe. iil. p. OA. 
This genus only differs from Nemognatha in having the antenne shorter and gradu- 
ally thickened outwardly. Gnathiwm contains four species, all from the United States 
or Mexico*. ‘The two Mexican species referred to it by Dugés belong to Nemognatha ; 
they have the thorax formed as in Gnathium. 
1. Gnathium francilloni. | 
Gnathium francilloni, Kirby, Trans. Linn. Soc. xii. p. 426, t. 22. fig. 6"; Blanch. in Cuvier’s Régne 
Anim., Ins. i. t. 55. fig. 6. | 
Nemognatha flavicollis, Lec. Journ. Acad. Phil. 2nd ser. iv. p. 93 (1858) °. 
Gnathium flavicolle, Horn, Trans. Am. Ent. Soe. ili. p. 95°. 
Hab. Norra America, Georgia !, Texas 2.—Mexico, Durango city (Hége). 
A single specimen from Durango city seems to belong to this species. It has the 
thorax elongate-campanuliform in shape, with a very few, fine, widely separated 
punctures; the elytra coarsely and roughly, but sparsely, punctured. ‘There can be 
little doubt as to the identity of Kirby’s and Leconte’s species. Kirby’s definition 
“ thorax brevissimus” is evidently a-misprint for ‘thorax longissimus,” as his figure 
clearly shows; his type is lost. ‘The head, elytra, under surface, and legs are piceous ; 
the thorax is flavo-testaceous. OE — 
2. Gnathium minimum. (Tab. XVII. fig. 17, var.) 
Nemognatha minima, Say, Journ. Acad. iii. p. 8306 (1824) +; Complete Writings, ii. p. 171°. 
Gnathium minimum, Horn, Trans. Am. Ent. Soe: iii. p. 94°. 
Gnathium walckenaeri, Casteln. Hist. Nat. Ins., Col. ii. p. 281 *. 
Nemognatha longicollis, Lec. Proc. Acad. Phil. x. p. 77”. 
Hab. Nort America ! , Rocky Mountains 2, Kansas °, New Mexico 3, and Texas? 5, 
—Mexico, Northern Sonora (Morrison), Vera Cruz + (Sallé). 
In this species the thorax and elytra are coarsely and somewhat closely punctured ; 
the upper surface is usually testaceous, the underside darker. G. longicolle (Lec.) is 
probably a dark form of G. minimum; it is not noticed by Dr. Horn in his Monograph 
of the genus. The Sonora specimens have the suture and the sides of the elytra in- 
fuscate, very much as in G@. longicolle. 
3. Gnathium nitidum. | 
Gnathium nitidum, Horn, Trans. Am. Ent. Soe. iii. p. 95 
Hab. os AMERICA, California +,—MExico (col F, Bates), Villa Lerdo in Durango 
(Hoge). cas 
* G. subcinctum, Luc., from Brazil, belongs to another genus. 
