64 ILLINOIS BIOLOGICAL MONOGRAPHS [382 



legs with femur twice as long as trochanter and slightly longer than tibia; length of 



body, 19 mm.; width of head, 2 mm.; on Aster prenanthoides ; Y-8, 81(?) 



lineata Norton. 

 10(9) Body on latus with grayish band lighter in color than grayish-purple dorsal band and 

 with three rows of distinct black spots; dorso-lateral and supraspiracular lines with 

 rows of small spots, two spots to each segment, with caudal spot much smaller and 

 sometimes nearly obsolete; spots on supraspiracular line largest; pedal line with a 

 row of spots, two to each segment, with cephalic spots smaller than caudal; head 

 with black spots on vertex large, sometimes coalesced, covering entire vertex except 

 genae and vertical furrows; front with faint gray spot; annulation, (3,5, 1), (7,2,4,6); 

 antennae, 2, (1, 5), (3, 4); maxillary palpi, (4, 2), (1, 3); labial palpi with distal 

 segment not quite twice as long as the preceding segment; legs with trochanter more 

 than one-half as long as tibia, femur equal in length to tibia; length of body, 21.5 

 mm.; width of head, 2.1 mm.; on Solidago juncea and Rudbeckia laciniata; Y-160-2, 

 -160-1 pulchdla Klug. 



Subfamily Cimbicinae 



Body cylindrical (Fig. 14), tapering uniformly caudad, apparently 

 glabrous, prothorax narrowed; segmentation indistinct; annulation fine, 7, 

 (2, 3, 4), (1, 5, 6), annulets 2, 4, and 7 microscopically setiferous; thoracic 

 legs normal in form, with five segments, femur slightly longer than tibia; 

 larvapods on abdominal segments 2-8 and 10, divided into two unequal 

 lobes on the distal surface, few setae on the dorso-caudal aspect, and none 

 on the cephalic aspect as viewed from side; tenth abdominal tergum with- 

 out suranal protuberances; suranal and subanal lobes with several short 

 setae; head large, rather thickly setiferous, normal in form; labrum sub- 

 divided by diverging depression into median lobe and two lateral lobes, 

 sometimes asymmetrical; antennae with a single segment, button-like but 

 chitinized; ventral glands wanting; glandubae microscopic or minute and 

 stalked, sometimes distinct conical tubercles; spiracles distinctly winged; 

 conspicuous spiracular glands located dorsad of each spiracle of abdominal 

 segments 2-8; cuticle microscopically and densely spinulate or verrucose; 

 mouth-parts normal in form, maxillary and labial palpi rather slender, 

 galea very thick, curved mesad at distal end, sericos large, distinctly 

 chitinized, pear-shaped, U-shaped, or V-shaped; stipes with a distinct 

 triangular projection on the dorsal or cephalic margin; body covered 

 with waxy bloom in life; larvae ejecting yellowish fluid from spiracular 

 glands when disturbed; free leaf -feeders, sometimes semigregarious. 



The Cimbicinae is a small compact subfamily consisting of few genera 

 and a limited number of species in the Nearctic region. Systematists are 

 in accord in the general conception of the group, but Konow includes the 

 Perginae in his subfamily Cimbicini. Cimbex americana, with its several 

 varieties, is a well-known representative of this subfamily. 



