390 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXII. 



Descri2)tion. — Head moderate, about as broad as the anterior portion 

 of the pronotum, into which it is inserted quite deeply; vertex very 

 narrow, barely one-fifth as broad as the interooular space and mod- 

 erately prominent, longitudinally narrowly sulcate; eyes large and 

 very prominent, semiglobular: basal segment of the antenna consid- 

 erably larger than the vertex as viewed from the front. Pronotum 

 long and moderately narrow, more than one and one-half times as 

 long as the greatest width; lateral lobes shallow, no more than one- 

 half as deep as long, vertical, not sinuate posteriorly; lateral carina? 

 sharp to the anterior transverse sulcus, thence continuing as barely 

 discernible rounded angles, parallel or subparallel; median carina prac- 

 tically a))sent or obscurely present on the hind border posterior of the 

 median transverse sulcus; disk flat, cut across the middle by a broad 

 shallow sulcus as described under the genus, and across the middle of 



Pigs. 74,75, 76.— Pi.agiostira ai.bonotata. 74, adult male. 75, cercus of male. 7(5, var. brevipes, 



ovipositor. 



the anterior third by a conspicuous transverse sulcus, which extends 

 down across the lateral lobes nearly to the lower border; anterior 

 margin truncate, posterior margin broadly rounded. Prosternum 

 unarmed; mesosternal lobes acutely prolonged. Legs variable, the pos- 

 terior f emone decidedly less than twice as long as the pronotum (tig. 74) 

 to two and one-half times as long, armed below on one or both mar- 

 gins with a few very minute spinules, or usuall}" unarmed, parallel 

 on the apical half or nearly so, the basal half very moderately swollen, 

 no more than two times as thick as the apical portion ; anterior tibite 

 armed above on the outer side only, with three or four spines. Wing- 

 covers about two times as long as broad, meeting above, usually over- 

 lapping, and extending beyond the pronotum in both sexes, a distance 

 equaling one-half the length of the pronotum in the male, sometimes 

 less in the female, the tympanum of the male occupying about one- 



