248 CALIFORNIA ACADEMY OF SCIEXCES [Proc. 4th Se«. 



and hind legs black; knees brown, middle tarsi brownish; hind metatarsi 

 not dilated; pile on hind legs white; wings smoky throughout, stigma 

 greyish brown. 



Holotype (No. 505), male, in Museum of the California 

 Academy of Sciences, collected at Corvallis, Ore., May 5, 1917, 

 by F. H. Nichols. 



Near P. ceratus but differs in shape of face, in pile of thorax, 

 in wings and legs. 



37. Criorhina aurea Lovett, new species 



Length 1 5 mm. Robust ; pile elongate ; face black ; abdomen 

 shining black, fourth segment entirely gray pruinose; pile of 

 second and third abdominal segments elongate, orange; of 

 fourth segment elongate, yellow; of fifth black; legs black, 

 coarse brown and black pilose ; tarsi lighter brown ; wings dark 

 brown, veins black and heavily shaded. 



Male: Antennal process moderately projecting; face concave below, 

 prominence only slightly projecting; heavily white pollinose including front; 

 cheeks shining, usual elongate light yellow pile from antennal prominence 

 out along eye margins to cheeks ; cheeks below with elongate brown and 

 black pile ; vertical triangle shining black and including occiput with 

 elongate heavy light yellow pile ; similar pile at base of antennal prom- 

 inence ; ocelli red ; antennae dark brown, red on basal half of third seg- 

 ment ; third segment comparatively small, not thinned except on margin, 

 rounding, not produced on outer angle, much produced to an obtuse point 

 on inner angle ; arista at middle of outer angle, moderately elongate, black, 

 lighter toward tip ; rim of antennal prominence shining brown. 



Thorax subshining, grey pollinose on anterior half, posterior half and 

 scutellum shining black ; pile elongate yellow ; black on transverse band at 

 base of wings, on scutellum more golden ; pteropleura with coarse black 

 pile. 



Abdomen shining black; first segment opaque black on disc, subshining 

 on posterior margin ; second subshining on disc ; fourth forms a character- 

 istic transverse band of grey pollen across abdomen ; pile elongate, golden, 

 thinned on disc of first and second segments, yellow on fourth and black 

 on fifth. 



Legs black, the knees and tips of tibise dark brown, the tarsi very light 

 straw brown ; pile of all femora black ; on basal third of front femur mixed 

 with brown; on basal half of middle femur mixed with yellow and brown; 

 hind femur below on apical third thickly set with short heavy spines ; pile 

 of tibiae coarse, short, very dark brown ; tarsi rounded, darker on distal 

 segments ; rather deeply incised and with tufts of short black conspicuous 

 spines on marginal angles. 



Wings with brown tinge, the veins conspicuously black, tinging the ad- 

 jacent membrane to an unusual degree ; halteres and squama:.- brown black, 

 the latter with a heavy fringe of elongate brown pile. 



Female : Similar to male in appearance and coloring. More robust, the 

 pollen of the face and front brown ; more black pile on cheeks ; pile on legs 

 darker; tarsi darker; spines not so conspicuous; spines on hind femur less 

 noticeable. 



