Occasional Papers of the Aliiseiiiii of Zoology 13 



c^ Smaller; usually two postquandragular cells. 



d\ Segment 7 colored like 8 chrysops. 



d^ Segment 7 darker than 8 alicnum. 



Abdominal patterns various but segments i and 2 with definite 

 dark areas or at least some segments definitely largely or entirely 

 black above. 



b\ Nasus and frons above black, face not bright yellow; the 

 brightest and most conspicuouslj' colored area is the middle lobe 



of the prothorax which is bright j^ellow peregrinum. 



h'. Face bright yellow or orange, frons above the same, and, with 



rare exceptions, on either side of and in front of the median 



ocellus, an area of the same color with metallic reflections. 



c\ Thoracic pale colors bluish or greenish : dorsum abdominal 



segments 8-10 black, on 8 the black narrowed from the base to 



a middorsal line at the apex ; yj narrowly but distinctly pale 



ringed at base. 



d\ Black on dorsum of head extended forward only to about 

 the level of the front of the median ocellus ; abdomen 37 



mm. long inca. 



d^ Black on dorsum of head extended forward to between 



the antennae ; abdomen 2^ mm. long ict crops'. 



c". Thoracic pale colors yellow or yellowish ; dorsum of abdom- 

 inal segments 8-10 various, but dorsum of 8 not continuously 

 dark in midline from base to apex. 



d\ Dorsum of abdominal segments 3-5 for two-thirds or more 

 the length of each segment with a wide median longitudinal 

 yellow stripe, bounded laterally by a dark line which thus 

 separates the dorsal and ventral yellow ; 8 with the dark 

 area above confined to the basal half ; 9 and 10 dark above ; 

 pale basal rings on 3-7 obscure or wanting. . .flavidorsum.^ 

 d^ Dorsum of 3-5 without a broad yellow stripe as above, 

 e^. Size large, abdomen over 40 mm. in length. 



f\ Segments 3-6 dorsally and laterally largely black ; 

 8-10 and the appendages to near the apex bright yel- 

 low ma jus. 



f^ Segments 3-6 dorsally and laterally narrowly pale 

 at base and black at apex, the intermediate area yel- 

 lowish or reddish, more or less obscured and dark on 

 the basal half of each segment; 8 largely or entirely 

 yellow or yellowish ; 9 and 10 black above. 



g*. Legs blackish crqiiatorialc. 



g^ Legs largely yellowish aiiguslipcnuc.'' 



' Known to me only from descriptions; see text. 

 * Known to me only from description; see text. 

 "Known to me only from description; see text. 



