372 THE CANADIAN ENTOMOLOGIST. 



depth of colour, but not extending much beyond the anal triangle; 

 membranule dark smoky brown, the basal third or fourth paler. 



Abdomen greatly constricted at seg. 3, slender and scarcely 

 expanding on 4, thence gradually widening to the distal end of 6 

 or even that of 7, beyond which it is considerably narrowed again. 

 Pile pale brownish, long and thick on segs. 1 and 2, elsewhere very 

 short. Genital lobes large, subangulate below, moderately in- 

 curved, with dense pile. 



Colour greenish black, but little shining, marked with dull 

 yellow as follows: Seg. 1, a large lateral spot. Seg. 2, a large 

 antero-ventral and usually a postero-ventral spot on each side, 

 narrowly separate or connected, the latter extending upon bases 

 of auricles; a pair of large, rounded postero-dorsal spots, which 

 may be narrowly connected with the postero-ventral spot, and a 

 pale, apical annulus. Seg. 3, a pair of small, antero-dorsal spots 

 and larger paler antero-ventral spots, continued caudad as narrow 

 marginal streaks. The remaining segments have no pale markings 

 except the brownish streaks along the tergal margins on the ventral 

 surface. 



The abdominal appendages (pi. X, figs. 4b, 4c) differ from those 

 forcipata as follows: The superior appendages are less arched in 

 profile with a less prominent distal ventro-lateral prominence; the 

 lateral carina extends farther distad and gives a broken appear- 

 ance to the outer margin in dorsal view, the apices are more acute. 

 The inferior appendage is a little shorter. The broken outer 

 margin and acute apices also distinguish the appendages from those 

 of incurvata and semicircularis, the latter differing also in other 

 points already noted. 



Female. — Similar to male in coloration with the following 

 slight differences: Abdominal segment 2 with a single large pair 

 of ventro-lateral spots and a pair of postero-dorsals, or these may 

 fuse to form one large lateral blotch. Seg. 3 with antero-dorsal 

 spots much larger and broadly connected with the antero-ventral 

 spots. The basal yellow spot of the hind wings may be very small 

 or indistinct. 



The shape of the abdomen varies much according to age, and 

 is similar to that of incurvata. Vulvar lamina about four-fifths 

 as long as 9th sternite, not elevated, spoon-shaped, broadest at 



