MCNEILL REVISION OF THE TRUXALIN^ OF NORTH AMERICA. 213 



minate, a little longer than the head and pronotum (female) or as long 

 as the hind femora (male). The pronotum has the disk plain, fur- 

 nished with three carinas, the median being a little more distinct, the 

 lateral being very slightly sinuate, and all three are cut much behind 

 the middle. The posterior margin of the metazone is very slightly 

 angulate. The lateral lobes of the pronotum are nearly perpendicular, 

 a little convex on the upper part with the anterior and the posterior 

 margins stiaight and strongly oblique and with the lower margin pos- 

 teriorly a little descending, anteriorly slightly ascending. The pro- 

 sternum is armed with a low (female) or high (male) tubercle. The 

 mesosternal lobes are separated by a space a little (female) or not (male) 

 broader than long. The metasternal lobes are very nearly approxi- 

 mate behind. The tegmina are much (female) or a little (male) shorter 

 than the abdomen, the scapular area is expanded and occupied by weak 

 cross veins in the male, the discoidal area is narrow without an inter- 

 calary vein and is filled with a single series of cross veins. The pos- 

 terior femora are moderately slender, extending beyond the abdomen. 

 The posterior tibiae have about 13 spines on the outer margin. The 

 valves of the ovipositor are very moderately exerted. 



This genus contains, so far as known, but a single species. It is 

 most closely related to Alcrniiria, but is easily distinguished from that 

 genus by the distinct lateral foveolje visible from above, the different 

 structure of the frontal costa just below the vertex, the abbreviated 

 tegmina, and tlie fewer spines of the posterior tibi^. 



Napaia gracilis, n. sp. Fig. 6a, 6b, 6c, 6d. 



Yellow or brown with a fuscous stripe extending backwards from the 

 eyes limited above by the lateral carinas of the pronotum, either cov- 

 ering the whole of the sides including the cheeks, lateral lobes of the 

 pronotum, the lower edge of the tegmina, the sides of the abdomen, 

 and the outer face of the posterior femora (male) or it is more or less 

 restricted below, but it is always present. The upper surface of the 

 body and head is distinctly lighter than the sides, plain, or sometimes 

 with two faint curved stripes extending on the top of the head from 

 the corners of the vertex to the lateral carinte of the pronotum. The 

 tegmina are plain except for the more or less infuscated lower edge. 

 In the male they are four- fifths as long as the abdomen, broadly rounded 

 at the tij). In the female they are half as long as the abdomen, lanceo- 

 late with the tip blunt. The posterior femora extend a little (female) 



[Pboo, D, A. N. S., VoL Vl.l 27 [December 16, 1896] . 



