354 NEW YORK STATE MUSEUM 
Mandible with a pair of apical bristles, palpus of the maxilla 
With Sete (2260 6. can Deals. Ses ook RR oe ee some (8) 
8 Middle tooth of the labium enlarged, ventral surface of 
labium with five pairs of setae [pl.37, fig.6]........... venustum 
Middle tooth not enlarged (varieties of venustum)............. (9) 
9 Labium with four pairs of ventral setae [pl.37, fig.14].......... var. a 
With seven pairs of setae [fig.5]...:-...5..:.55: var. piseletazgam 
Pupae 
(Arranged according to the number of filaments in each respiratory 
tuft) 
1 With six filaments 
a Legs in their cases appear bicolored’...... eM venustum 
G-Lhess “imicdlored... 45.22 3 
2 With eight filaments 
a@ Pupa 4.5mm long; Arizona species. Pupa described in 
Am. Ent. Soec..Trans. p.45. 1893. 
b Less than 4mm long; eastern specieS...............2008 
venustum, var. Dis © letgawem 
3 With nine filaments. Pupal case like that on pl.35, fig.5...piectipes 
rn 8 oles CUS GRE: W001 2. 0d heey PR, Ce alt ne pe ee var. a of venustum 
5 With 12 filaments. Pupal case [pl.35, fig.5]. From Santa 
Cruz mountains, Cal. [p.387] 
qewecseseunvececceceeccs «MG Eine ——n—n 
Go Wath 16° filaments. (3. 5 ios6 cide knne Voca wie a eee vittatum 
% With 24. to 48 filaments [pl.33, fi¢.10]....%.0.0 5. 2 - te eee pecuarum 
iS WW GU or more TlaAments 2 2202. sv ores a Serine ee os! ores hirtipes 
Imagines 
1 Ground color of the thorax and abdomen deep yellow.............. (2) 
Gray or black; its hairs may be pale..:...............295eenn (3) 
2 “ Femora with black tip, length of fly 2mm.” Mexico..occhraceum 
“Femora without black tips. Length 3 to 4.5mm. Rocky 
FOUR EAI Po oo oa Baers an crept ue etlacecinve te ee, GU a a ee ea ee fulyum 
3 Hind tarsi with its basal joint partly yellow; legs bicolored ........ (9) 
Hind tarsi unicolore@?. .... oc. sce Ses Sco © «eve sa lesn are y whekeele (4) 
4 Halteres dusky; thorax not striped. s....i.. 2.0... 0.2. a. ee (5) 
Halteres white or yellow; the female with striped thorax and 
bifid: tarsal claws... nos Ge oe oe eee ee (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... Leneth Ss: ta: 4.5mm: 33s oe ee eee caer Se. 6 Bee 
“Body gray, legs reddish gray, feet black; length 3mm.” 
This is said by Mr Coquillett to be the same as pec ua- 
F 40 . FENSY «a. 0. cs See wee eee ea eee aia eee ee invenustum 
GS Males, eyes: contigtiows. 0.2. 27,4 ine wae Se Le eee ohn pale (7) 
Kemales, eyes separated by a distinet lime. .....5....°22.. 0. eee (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. 
RN 
