60 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



or five long bristly black hairs, front tibi;e gradually dilated, tbe inner 

 border more sinuate than in P. hyperhorevs, the outer angle at the tip 

 moderately acute, their metatarsi moderately dilated, thence gradually 

 narrowed to the tip of tarsi ; hind metatarsi thickened. Wings faintly 

 brownish tinged. 



Two specimens, Washington Territory. This species will be distin- 

 guished from P. hyperhoreus, to which it is most nearly allied, by the 

 large spot on the second abdominal segment, by the presence in the 

 male of spots on the fifth segment, by the bristles on tbe front femora 

 of the male, by the external angle of the front tibiae not being pro- 

 duced lappet-like. From P. peltatus, the front legs in the male and the 

 facial profile will at once distinguish it. 



Platychirus ciliatus. 



Plat jichelrng ciliatHS Bigot, Annales Soc. Ent. Fr., 1884,74. 



Habitat. — California (Bigot), Colorado ! 



<?. Length, 8""™. Face nearly uniformly gray poUinose. Third joint 

 of antenna' twice as long as wide, partly reddish. Dorsum of thorax 

 and scutellum shining brassy black. Abdomen contracted in the middle, 

 opaque black ; the first segment, the sides of the second, the fifth seg- 

 ment, and the hypopygium, shining metallic. Second segment on the 

 sides with a small spot, third and fourth in front with a larger, oblique 

 lateral spot, yellow. Legs yellow ; the front and middle femora in part, 

 the hind pair chiefly, black ; front femora on the outer side with a rather 

 dense and long row of black pile; front tibiae with a tuft of black i)ile 

 without beyond the middle, considerably dilated on last fourth, squarely 

 truncate at the tip ; front metatarsi much dilated, squarely truncate, 

 second joint very short and transversely dilated to the full width of the 

 metatarsus, the next two joints successively less dilated ; middle tibiae 

 arcuate on outer half; hind metatarsi thickened and elongate. Wings 

 hyaline. 



9 . Antennae black. Abdomen with a pair of quadrate spots on the 

 third and fourth segments, the spots on the second small or obsolete. 

 Femora black, except the tip; intermediate, and especially the hind 

 tibijB, brown in the middle; hind metatarsi elongate. 



Three specimens, Colorado (National Museum, Professor Riley's col- 

 lection). The color of the legs probablj' varies somewhat. This species 

 is very ])robably the one described as P. ciliatu.s by Bigot, but as the 

 author omits the most distinctive characters (the structure of the fore 

 legs), and as his types were from California, it will be well to reproduce 

 his description. 



P. ciliatus. $. Long. S"*"'. I\igcr. Anfennis. se(/)ncnto 3° subtusfidvo 

 obscure notato ; facie cinerco pruinoso ; thorace acittelloquc nitidis, fiisco 

 villosis ; calyptris et halteribus cinereis, clavd nigra; abdomine nigro 

 opaco, albido longe villosulo, maeulis utrinqiie tribx.s trigonis, cinereis^ 

 segmento 5'^ nitido; femoribus ant ids, subtiis, longe nigro villosis, pedibus 

 anticis intermediisque testaceis, femoribus et tibiis intermediis late nigro 



