40 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



brown tinge, margins ciliate, surface hairy. Median vein close 

 to and parallel to cubitus, cubitus in about middle of wing area, 

 with 12 branches to lower margin; wing scale hairy, 0.70 mm. in 

 length. 



Legs yellow-brown, pubescent. 



Abdomen with tergites dark castaneous-brown, with dense short 

 and long hairs; sternites lighter colored with central area yellow- 

 brown. 



Measurements. — 



Length of entire winged adult, 13.5 mm. 

 Length of entire dealated adult, 7.5 mm. 

 Length of head (to tip labrum), 1.35 mm. 

 Length of pronotum, 0.80 mm. 

 Length of hind tibia, 1.85 mm. 

 Length of anterior wing, 11.5 mm. 

 Diameter of eye (long diameter), 0.35 mm. 

 Width of head (at eyes), 1.35 mm. 

 Width of pronotum, 1.20 mm. 

 Width of anterior wing, 2.80 mm. 



Close to Tietero'pterus Silvestri but darker colored and with 

 broader head and larger eyes. 



Major soldier (pi. 3, figs, 9-10). — Head dark castaneous-brown 

 to black, head lighter colored at posterior margin, also at base 

 of antenna, tip of nasus light castaneous; head semipear shaped, 

 markedly constricted at anterior third, nasus forms rounded saddle 

 with head, deeper than in heteropterus Silvestri, head broadest 

 posteriorly, narrows anteriorly beyond constriction; three rows of 

 long bristles on head. Nasus elongate, narrow. Mandibles promi- 

 nent, elongate, narrow. 



Antenna light castaneous-brown, 14 segments, pubescent; third 

 segment elongate, slender, subclavate, over twice as long as second 

 segment and longer than fourth segment; fourth segment sub- 

 clavate, approximately of the same size as the fifth and sixth to 

 ninth segments; tenth to fourteenth segments become gradually 

 shorter; last segment slender and suboval. 



Pronotum dark castaneous-brown, saddle-shaped, long bristles on 

 anterior and posterior margins. 



Legs yellow-brown, elongate, slender, pubescent, hind tibiae as 

 long as head with nasus. 



Abdomen with tergites light castaneous (gray) brown, row of 

 long bristles at base of each tergite; sternites lighter colored with 

 longer bristles, densest at end abdomen. 



Major soldier darker than N. {V.) heteropterus^ nasus at more 

 of an angle to the head; different type of soldier than in heehei 

 Emerson where the head is broadest anteriorly ; type of soldier also 

 different from that of velox Holmgren. 



