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 dorsiim of the 

 abdomen are more plainly yellow. 



Type male, alotype female and four paratype males from 

 Arequipa, Peru, October 28, 1S9S. 



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, Peru. 



ASEMOSYOPHUS Bigot. 



Asemosyophus bicolor Bigot. Two specimens taken at Lake 



Amatitlan Fel^ruary 7, 11)05. 



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. 



vStilbosoma Philippi. 

 Stilbosoma cyanea Philippi. This shining green species 

 with red front and face and black antennae 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. 



