S54 NEW YORK STATE MUSEUM 



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



with setae (8) 



8 Middle tooth of the labium eularg-ed, ventral surface of 



labium with five pairs of setae [pl.oT, fig.G] venustum 



Middle tooth not enlarged (varieties of venustum) (9) 



9 Labium Avitli four pairs of ventral setae [pi. 37, fig.l4] var. a 



With seven pairs of setae rfig-r>l var. p i s c i o i d i u m 



Pupae 



(Arranged according to the number of filameuts in each respiratory 

 tuft.) 



1 With six filaments 



Legs in their cases appear bicolored^ venustum 



ft Legs unicolorod m e r i d i o n a 1 e 



2 With eight filaments 



a Pupa 4.5mm long; Arizona species. Pupa described in 

 Am. Ent. Soc. Trans, p.45. 1803. 



6 Less than 4nim long; eastern species 



venustum, var. p i s c i c i d i u m 

 S With nine filaments. Pupal case like that on pl.3o, fig.'S. . .p i c t i p e s 



4 With 10 filaments var. a of venustum 



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



Cimz mountains, Cal. [p. 387] 



6 With IG filaments v i 1 1 a t u m 



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



8 With 6<) or more filaments h 1 r t i p e s 



Imaffines 



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



Gi-ay or black; its hairs may be pale (3) 



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

 " Femora without black tips. Length 3 to 4.5mm. Rocky 



mountains " f u 1 v u m 



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



Hind tarsi imicoloreds (4) 



4 Halteres dusky; thorax not striped (5) 



Halteres white or yellow; the female with striped thorax and 



bifid tarsal claws (6) 



■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 Ooquillett to be the same as p e.c u a- 



r u m Riley '....: invenustum 



6 Males, eyes contiguous C^) 



Females, eyes separated by a distinct line (8) 



^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 pictipes sometimes has legs nearly unicolored; it is 

 however included in the preceding section. 



