■354: NE\A' YORK STATE MUSEUM 



Mandible with a pair of apical bristles, palpus of the maxilla 



with setae (8) 



8 Middle tooth of the labium enlarged, ventral surface of 



labium with five pairs of setae [pi. 37, fig.6] v e n u s t u m 



Middle tooth not enlarged (varieties of v e n u s t u m i (9) 



9 Labium with four pairs of ventral setae rpl.37, fig.l4] var. a 



AYith seven pairs of setae [fiS-o] var. p i s c i c i d i u m 



Pupae 

 (Arranged according to the number of filaments in each respiratory 

 tuft) 



1 With six filaments 



a Legs in their cases appear bicolored' v e n u s t u m 



h Legs i^nicolored m e r i d i o n a 1 e 



2 With eight filaments 



a Pupa 4..jmm long; Arizona .species. Pupa described in 

 Am. Ent. Soc. Trans. p.4o. 1893. 



h Less than 4mm long; eastern species 



V e n u s t u m , var. p i s c i c i d i u m 



3 With nine filaments. Pupal case like that on pl.35, fig.o. . .p i c t i p e s 



4 With 10 filaments var. a of v e n u s t u m 



5 With 12 filaments. Pupal case [pl.35, fig.o]. From Santa 



Ciiiz mountains, Cal. [p.387] 



6 With 10 filaments v i t t a t u m 



7 With 24 to 48 filaments [pl.33. fig.lO] p e c u a r u m 



S With <U> or more filaments h i r t i p e s 



Imagines 



1 Ground color of the thorax and abdomen deep yellow (2) 



Gray or black; its hairs may be pale (3) 



2 " Femora with black tip, length of fiy 2mm." Mexico, .o c h r a c e u m 

 " Femora Avithout l)lack tips. Length 3 to 4.5mm. Rocky 



mountains " f u 1 v n m 



3 Hind tarsi with its basal joint partly yellow; legs bicolored (9) 



Hind tarsi unicolored2 (4) 



4 Halteres dusky; thorax not striped (5) 



Halteres white or yellow; the female with striped thorax and 



bifid tarsal claws (G) 



5 Body black; the female with dense yellow pile, her tarsal 



claws simple; the male with dense hair on the legs, his 

 tarsal claws trifid. The wing with its radius three 



branched. Length 3 to 4.5mm h i r t i p e s 



"Body gray, legs reddish gray, feet black; length 3mm." 

 This is said by ^Mr C'oquillett to be the same as p e c u a- 

 r u nx Riley i n v e n u s t u m 



6 ^lales. eyes contiguous (7) 



Females, eyes separated by a distinct line (8) 



\ 



i 



^In order to see this it will be necessary to examine nearly mature speci- 

 mens and perhaps to draw them from their pupal skins. 



2The male of p i c t i j) e s sometimes has legs nearly unicolored; it is 

 however included in tin' preceding section. 



