24 PROCEEDINGS OF THE NATIONAL MUSEUM. 



notum enlarging slightly (male) or considerably (female) in passing 

 backward, with distinct percurrent median carina and sometimes dis- 

 tinct, sometimes scarcely perceptible lateral carinae, the dorsum very 

 broadly tectate in the first case, obscurely so in the second, the lateral 

 lobes snbvertical or vertical; both front and hind margins transverse, 

 the latter emarginate; prozona sparsely punctate, as long as its pos- 

 terior breadth, about twice as long as the densely punctate metazona, 

 cut in the middle by a distinct, straight, transverse sulcus, and followed 

 at less than half the distance to the metazona by a similarly impressed 

 transverse sulcus of variable direction. Prosternal spine conical, erect, 

 in the male rather long; interspace between mesosternal lobes sub- 

 quadrate but much narrower than the lobes in the male, distinctly 

 transverse and nearly or quite as broad as the lobes in the female, the 

 metasterual lobes attingent or approximate in the male, moderately 

 distant in the female. Tegmina rather long elliptical, fully as long as 

 the prozona. Fore and middle femora tumid in the male; hind femora 

 not very long and rather stout, but subcompressed, the hind tibiae with 

 nine to ten spines in the outer series. Extremity of the male abdomen 

 subclavate, but elongate by the posterior extension of the subgenital 

 plate, as in Barytettix, as a blunt conical tubercle; lateral margins of 

 this plate straight from the base, the apical margin well rounded, reach- 

 ing beyond the tip of the supraanal plate by a brief distance; cerci 

 and furcula as in Barytettix. 



The type of this genus is C. miguelitana, the only one in which both 

 sexes are known. 



Three species are here described ; they occur in Mexico and south- 

 western New Mexico. 



ANALYTICAL KEY TO THE SPECIES OF CONALCAEA. 



A 1 . Lateral carinae of pronotura distinct; posterior margin of prouotum distinctly 

 emarginate. 



.6'. Tegmina well rounded at tip ; hind tibiae red 1. miguelitana (p. 24). 



& 2 . Tegmina apically truncate; hind tibiae luteous or flavescent. 



2. truncatipennis (p. 25). 



A 2 . Lateral cariuae of prouotum obscure, the dorsum passing almost insensibly into 

 the lateral lobes; posterior margin of i>ronotum only faintly emarginate; lobes of 

 furcula of male much broader than long, scarcely projecting. 



3. neomexicana (p. 26). 



i. CONALCAEA MIGUELITANA, new species. 

 (Plate II, fig. 8.) 



Fusco-testaceous, more or less lutescent beneath, very sparsely pilose. 

 Head dull luteous (male) or olivaceo-testaceous, much infuscated (female), 

 the vertex always more or less infuscated and especially marked with 

 a pair of dark streaks divergent from the base of the fastigium ; genae 

 much mottled witli fuscous, particularly in the female; fastigium sulcate 

 between the eyes and feebly, in the male only, beyond; frontal costa 

 barely reaching the clypeus, nearly plane but depressed at the ocellus 

 in the female, feebly sulcate except at summit in the male, punctate 



