346 THE UNIVERSITY SCIENCE BULLETIN. 



yellow except for black spots on humeral angles. On either side of the 

 pale median line are two large usually quadrate black spots, the grooves 

 on either side of these are broadly black and parallel to the lateral mar- 

 gins, and extending on parallel to the adjacent portions of the posterior 

 margins, are right-angled black marks on either side. The mesonotum is 

 honey-yellow marked with black as follows : Between the arms of the W, 

 a line extending back from these to the pale cruciform elevation with a 

 dot on either side, and laterally two large triangular posteriorly tapering 

 spots which reach the posterior margin. Abdominal terga black with the 

 posterior margins honey-yellow, the terminal segments almost wholly 

 light. The wings have the veins almost entirely honey-yellow but slightly 

 darkening apically, and usually distinctly infuscated. The basal areoles 

 of the fore wings are opaque and dark brown or brownish-yellow. The 

 flaps are grayish tinged with yellowish or orange. Beneath the insect is 

 almost wholly honey-yellow. The legs are of the same color but strongly 

 marked with dark brown, the tarsi being dark. 



Form : The following are the measurements in millimeters of the speci- 

 mens at hand: 



Length of body 15 to 18 . 5 



Width of head 4.5 to 5.25 



Expanse of fore wings 38 to 44 



Greatest width of fore wing 5.75 to 6 



Greatest width of operculum 1.25 to 2 



Greatest length of operculum 2.5 to 2.75 



The opercula are very small and narrow, strongly curved on both sides 

 and ending in an obtusely pointed apex which points mesad and ends in 

 about a line with the exterior margin of the coxa. 



Genitalia: The supra-anal plate of the male is slightly but broadly 

 emarginate on the posterior margin. The uncus, viewed laterally, is nar- 

 row basally, then widens to widest point and then tapers to rather obtuse 

 apex. Viewed caudally it is broadly elliptical and slightly emarginate 

 ventrally. The ventral piece has very stout arms which are deeply 

 divided and whose apices suddenly narrow and turn slightly mesad. The 

 last ventral segment of the male is distinctly less than twice as wide as 

 long, the lateral margins are distinctly sinuate and the apex is truncate. 

 The pygofers of the female have the posterior margins distinctly sinuate 

 to the very small but distinct median tooth. The last ventral segment of 

 the female has the lateral margins slightly sinuate and the posterior mar- 

 gin is broadly and deeply emarginate nearly three-fourths of the distance 

 to the base. The ovipositor is stout and the lateral pieces are each sup- 

 plied with about thirteen very regular ridges and teeth. 



