28 PROC. ENT. SOC. WASH., VOL. 23, NO. 2, FEB., 1921 



vertex in the male, the point where it meets the vertex being narrower in the 

 male than in the female, in the former not, or barely, broader than the basal 

 segment of the antennae; face moderately declivous. Pronotum with distinct 

 median and lateral carinae, the former cut at, male, or a liftle behind, female, 

 the middle by the principal transverse sulcus, which also cuts the lateral carinae; 

 lateral carinae converging in the anterior third and then diverging to the pos- 

 terior margin of the pronotum, the broadest part of the disk being about twice 

 as broad as at the narrowest point; anterior margin of pronotal disk truncate, 

 posterior margin obtuse-angulate; lateral lobes quadrate. Organs of flight fully 

 developed, the tegmina and wings of equal length, extending to, or barely be- 

 yond, the tips of the posterior femora; tegmina of the male with the costal area 

 decidedly broadened, the transverse veins parallel ami diagonal, growing more 

 transverse towards the apex of the area; intercallary area subequal in width, 

 about as broad as the ulner area at its widest point, intercallary vein absent; 

 wings less than twice as long as broad, the margins evenly rounded, as a whole, 

 but with moderate undulations between each radiate vein, a more decided notch 

 at the terminus of the first one. Legs moderately slender; posterior femora 

 flattened on the outer face, the carinae well elevated; posterior tibiae with the 

 inner apical calcars equal in length and scarcely more than half as long as the 

 inner ones, and similarly shaped. Abdomen moderately compressed; supraanal 

 plate apically pointed, more so in the male, the sides somewhat rounded; subgeni- 

 tal plate of male apically pointed and directed upwards, that of the female flat 

 and horizontal and apically narrowly cleft; cerci of both sexes conical, somewhat 

 more elongate in the male; valves of ovipositor short, free, the margins smooth. 



Type. Megaulacobothrus fuscipennis Caudell. 



In the key to genera of the Truxalinae given by Bruner 1 

 this genus falls under Stenobothrus on page 122. But it is amply 

 distinct from that genus. 



Megaulacobothrus fuscipennis, n. sp. 



Description, male and female. Size large. Head as broad as the anterior por- 

 tion of the pronotum; eyes elongate, apically pointed above, reddish brown, 

 unicolorous; occiput without carina but with a mesial light stripe bordered on 

 each side by a black one, and below that, on each side, with one or two more 

 alternate black and lighter stripes, varying in distinctness in different specimens; 

 antennae dark brown, often lighter basally, and consisting of about twenty-five 

 or twenty-six segments in the male, all but the apical four or five, which are very 

 small and short, being elongate; in the female probably of about the same num- 

 ber of segments, though in the only entire antenna of this sex examined the apical 

 ones are fused into one long indistinctly divided segment. Pronotum light 

 brown in color, the disk with the lateral carinae marked in yellow and margined 

 outwardly along the middle and inwardly behind with fuscus; lateral lobes with 

 some obscure light colored callouses. Abdomen blackish above and laterally at 

 the base, the black giving way laterally along the middle to yellowish and the apical 



'"Revision du Systeme des Orthopteres et description des especies rapportees 

 par M. Leonardo Fea de Birmania" (Ann. Mus. Civ. Stor. Nat. Geneva, Vol. 

 xxxiii (2a, xiii), p. 1-230, pi. i-vi (1893). 



