snow: AMERICAN PLATYPEZID.^l. 1 49 



the length of the second posterior cell; anterior branch of fourth 

 vein well arcuated, comparatively short; posterior branch very long, 

 almost touching wing margin. 



Length 2^ to 3^^ mm. 



Nineteen specimens, Hop Canyon, Magdalena Mts. , N. M.; 7,500- 

 8,500 feet; August. Found mostly near where P. calceata abounded. 

 They were not observed to hover in the air as was cakcata but they 

 dodged about with ordinary flight near a small spruce tree. Nearly 

 all were taken on a single day. A few were caught as they ran about 

 on leaves. 



Platypeza tseniata n. sp. 



Female. Cinereo-fuscous. Basal joints of antennae yellowish; 

 proboscis lutescent; humeri brownish. Abdomen grey with posterior 

 opaque fuscous or black cross bands on segments two-five; the black 

 occupies nearly the whole of second segment, on the following seg- 

 ments the grey prevails; sides of bands parallel — bands not widened 

 in middle. Legs brown, hind pair fuscous; hind tarsi in general 

 resembling figs. 3, 4, PI. 12, with wide shallow fossa on outside of 

 joints three and four; second joint very short, obliquely transverse, 

 longer on upper side than on under side, third joint longer than first 

 two together. Halteres pale yellow, almost white in described speci- 

 men. Wings hyaline, veins brownish; first basal cell of same length 

 as second costal cell; posterior crossvein nearly touching border of 

 wing; posterior branch of fourth vein short. 



Length 3 mm. 



One specimen, Illinois, Professor Forbes; No. 56S9. 



Must be near P. boleiiiiaoi Europe,* whose black abdominal bands 

 are widened in their middle. 



Platypeza pulchra n. sp. — PI. 12, fig. (i. 



Male. Black, cinereous. Face, front, and antennae concolorous; 

 proboscis lutescent; occiput velvety black. Humeral callosities sub- 

 lutescent; dorsum with two obscure fuscous stripes. First segment 

 of abdomen opaque black anteriorly, buff posteriorly; second and 

 third segments buff with narrow median black stripe; fourth and fifth 

 segments velvety black; sixth segment grey; incisures between fourth, 

 fifth and sixth segments narrowly pallid on the sides; the third 

 segment may have a lateral fuscous spot; long pile on sides of abdo- 

 men glistening yellowish except on segments five and six, where it 

 is black; venter buff. Legs subinfuscate-lutescent, a little cinereous; 

 immediate base and tip of femora lutescent; four front tibial and tarsi 

 hardly infuscate except on distal joints of latter; first joint of hind 



Shiuer, Fauna Austrica, Vol. I, p. 241. 



