June, 1914.] 
Diptera of Middle America. 
343 
segment with a large yellow triangular marking on each side, third 
with a similar shaped marking which is yellow outwardly and gray 
inwardly, fourth with a similar shaped marking which is nearly 
all gray; venter mostly pale. Hypopygium exserted and pro¬ 
truding forward under the abdomen to about the middle of the 
third segment. 
Female. Like the male but the markings of the dorsum of the 
abdomen are more plainly yellow. 
Type male, alotype female and four paratype males from 
Arequipa, Peru, October 28, 1898. 
Dolichogyna chilensis Guerin. This species was described 
as Helophilus but if I have made a correct determination it should 
be placed in this genus. Helophilus pictus Philippi I consider a 
probable synonym. Nearly a dozen specimens from Arequipa 
and Puno, Peru, have been placed here. 
Dolichogyna fasciata Macquart. Helopnilus chilensis Walker 
and Dolichogyna hahni Bigot have been placed as synonyms by 
Williston. This is the type of the genus. Five specimens from 
Santiago, Valparaiso and Chiloe, Chile, are determined as fasciata. 
The markings of the abdomen are mostly bright yellow and nearly 
the whole body is clothed with prominent yellow pile. 
Dolichogyna nigripes Bigot. A male specimen with the face 
produced and legs mostly black is placed here. The middle and 
front tarsi are flattened and the comers at the apex of each seg¬ 
ment are produced into rather long appendages thus forming a 
pronounced type of foot very different from that present in the 
other species. The knees, bases of all the tibiae and all the tarsi 
are yellowish while the other parts of the legs are shining black. 
One specimen from Puno, Pern. 
Asemosyophus Bigot. 
Asemosyophus bicolor Bigot. Two specimens taken at Lake 
Amatitlan February 7, 1905. 
Asemosyophus mexicanus Macq. Two males and a female 
from San Antonia Canyon, California, July 25, 1907. 
Xylota Meigen. 
Xylota chloropyga Schiner. A specimen from Bartica, British 
Guiana. 
Xylota coerulea Rondani. Same as Strephus antennalis 
Philippi. One specimen from Alhue, Chile. 
Stilbosoma Philippi. 
Stilbosoma cyanea Philippi. This shining green species 
with red front and face and black antenna) is one of the most 
striking spryphides I have seen. Three specimens from Santiago 
and Quillota, Chile. 
Ceria Fabricius. 
Ceria tricolor Loew. Two specimens from Holguin, Cuba, 
collected by H. S. Parish, December 23, 1904. 
