A. A, GIRAULT. 



39 



longer in proportion to their width than is usual in the genus 

 mentioned but of the same width and shape. The mandibles 

 bear several more teeth, about five in all. 



Normal position. 



Female. — Head normal, somewhat wider than the thorax, 

 the eyes ovate, the ocelli three in number in a flat triangle 

 on the vertex ; antennae inserted slightly below the middle 

 of the face, 6-jointed — scape, pedicel, one ring-joint, two 

 funicle joints and a solid club, the pedicel distinctly longer 

 than the first funicle joint, the pubescence not conspicuous, 

 consisting of short, soft, fine hairs. Thorax somewhat shorter 

 than the abdomen, the parapsidal furrows complete, widely 

 separated, straight ; abdomen along the meson about equal 

 in length to the head and thorax combined, moderate in 

 length, from the dorsal aspect acutely triangular, from the 

 lateral aspect conic ovate, the venter oblique, the valves of 

 the ovipositor borne along at least the distal two-thirds of 

 the venter and projecting distinctly beyond the tip of the 

 abdomen but not conspicuously (fig. 13); slightly exserted. 

 Cilia of the last pair of spiracles conspicuous, projecting from 

 each side of the tip of the abdomen. 



Fore wings (fig. 11) long, about two and a quarter times 

 longer than wide, regularly rounded, the margins of the blade 

 similar, the marginal cilia not very long but not short, moder- 

 ately short to moderately long, about twice the length of those 

 usual to Penta7'thron but not more than an eighth or ninth 

 the greatest wing width, the discal cilia moderately dense, 

 moderately large, distinct ; an oblique line of discal cilia 

 running proximo-caudad from the stigmal knob ; discal cilia 

 arranged in about from 15 to 20 longitudinal lines, uniform 

 but not all of the lines in regular rows. Venation forming 

 a bow as in Pentarthron, the marginal and stigmal veins sub- 

 equal in length, the latter slender ending in a small truncate 

 knob which bears a short uncus ; the submarginal vein about 

 two and a quarter times longer than the marginal vein. 

 Postmarginal vein absent. Posterior wings (fig. 12) long 

 and narrow, sharply acuminate, acute at apex, the margins 

 of the blade similar distad of the marginal vein, the cephalic 



TRANS. AM. ENT. SOC, XXXVII. 



