278 GEOLOGICAL SURVEY OF THE TERRITORIES. 



as a genus, as the distinguishing characters are sufficient to separate it 

 from Stenobothrus. Hippopedon (Saussure) approaches rather too near 

 this genus to remain as a separate group. 



ACROLOPHITUS, (NOV. GEN.) 



Generic characters: GEdipodiform, head pyramidal, apex directed 

 upward. Occiput narrowed anteriorly, ascending ; vertex pyramidal, tri- 

 angular, pointing upward between the eyes and antennae j eyes ovate, 

 placed high and well forward ; face vertical, carinated ; frontal ridge, 

 sulcate. Maxillary palpi medium length, terminal joints sub-equal, 

 rather short ; labial palpi proportionally longer, ultimate joint longest. 

 Antennae stout sub-planate, basal joint very large, triangular, inserted 

 in deep oblong foveolse under the pyramidal vertex ; medium length. 

 Pronotum of moderate length, coarctate ; posterior lobe with the me- 

 dian carina elevated in the form of a crest arcuate on the top, the sharp 

 posterior angle extending over the base of the elytra ; the anterior por- 

 tion rounded on the dorsum, not carinated ; the three transverse incis- 

 ions distinct, two sinuous, three bent abruptly forward round the point 

 of the crest. Elytra narrow, reaching beyond the abdomen ; wings 

 ample ; legs long, slender, and pilose. Prosternum not spined j pectus 

 narrow. 



A. Mrtipes, Thos. Syn. Gryllus Mrtipes, Say. (Amer. Ent., Ill, PI. 

 XXXIV, Le Conte's Ed., I, 78, PI. XXXIV, Fig. 1.)— The description 

 given by Mr. Say, with the figure, will enable the entomologist readily 

 to determine this species. The figure gives rather too dark a shade to 

 the abdomen and thorax, which is also the case with the next figure on 

 the same plate, (Gryllus formosus ;) the color of these parts varies from 

 a pale greenish yellow to a brownish yellow. I have formed the genus 

 Acrolopliitus for the reception of this species, which should no longer 

 remain buried in the old genus Gryllus, which is now restricted to proper 

 limits. I may be permitted to remark here that I had the good fortune 

 while in Colorado to pass over the same ground traversed by Mr. Say, 

 and to obtain specimens of all the species of Gryllus described by him, 

 viz : aqualis, bivittatns, formosus, Mrtipes, nubilus, and trifasciatus. 

 All of these have now been placed in modern genera, except formosus, 

 for which probably a new genus will have to be formed. 



TOMONOTUS, (SAUSS.) 



T. nietanus, Sauss. (Orthop. Xov. Amer. II, 24. Rev. et Mag. de Z00L, 

 1861, p. 321.) 



T. mexicanus, Sauss. (Orthop. Nov. Amer. II, 23. Eev. et Mag. 

 et de Zooh, 1861, p. 321.) — I have specimens of two species of Tomo- 

 noti, which, I think, belong to the species thus named by Saus- 

 sure; they certainly agree very closely with his short descriptions. 

 The T. nietanus, when living, appears quite black ; its bright-red wings 

 being visible at a considerable distance when flying, and the sharp 

 notes of the males being easily recognized by the ear which has once 

 heard them. It is closely allied to the Oe. sulphurea Burm, which be- 

 longs to this genus ; the notes of the male of this species can also be 

 recognized by the practiced ear. It is possible that the notes of the 

 males may, under some circumstances, enable us to determine whether 

 certain differences are specific or only of variety. 



The generic characters by which Saussure proposes to distinguish 

 this genus are not well chosen, as they scarcely cover the group he evi- 

 dently intended to embrace ; nor is the gap between Ocdipoda and 

 Gomplwcerus or Tragocephala quite broad enough for the insertion of a 



