AET. 1 NEW DIPTERA FROM SOUTH AMERICA ALDRICH 7 



Described from two males, collected at Perales, Chile, February 

 1925, by Father Anastasio Pirion, received from Alfredo Faz, who 

 has retained some additional specimens. 



Type.—M2i\2, Cat. No. 28897, U. S. N. M. 



Genus HYDROTAEA Robineau-Desvoidy 



Hydrotaea RoBiNEAU-Desvoidj^ Myodaires, 1830, p. 509. 

 HYDROTAEA FUSCISQUAMA, new species 



Deep black, including palpi, antennae and legs; closely allied to 

 E. dentipes Fabricius, but having infuscated calyplers with black 

 rim and fringe, and the abdomen with light blue pruinosity. 



Male. — Front including parafrontals black, about as wide in mid- 

 dle as the ocellar triangle; parafacials silvery from the antennal 

 insertion down, becoming brown on lower part ; lunule small, golden. 

 Two or three upturned bristles on the cheek next to the vibrissae. 



Thorax rather shining black, only when viewed directly from be- 

 hind is there is trace of brown pruinose stripes anteriorly. Acrosti- 

 chal 3,5; dorsocentral 2,4; humeral 3; posthumeral 1; presutural 1; 

 notopleural 2; supraalar 3 (small except middle one) ; intraalar 3; 

 postalar 2; sternopleural 1,1 (some posterior large hairs almost like 

 bristles). Halteres black. Calypters, as noted above, the posterior 

 projecting far beyond anterior. 



Abdomen with striking light blue color on black ground, only a 

 trace of median dark stripe. The blue pruinosity extends on venter 

 to the membrane, and even on the sternal plates. 



Legs shining black, pulvilli white and not enlarged. Front femur 

 with the usual two thorns below near tip; on the outer flexor side 

 below near base are five long bristles, on the inner side just before 

 the thorn is a row of about six short depressed spines. Front tibia 

 irregularly flattened and concave on flexor side, on outer flexor side 

 near tip with elongated brush-like series oi erect hairs. Middle 

 femur with two rows of bristles on front side of basal half, the lower 

 long; a uniform row of small slanting bristles on hind side, and on 

 lower hind side a row of long straight spines on basal half. Middle 

 tibia with rather dense, short, suberect hairs on whole length of front 

 side, on hind side two bristles near middle. Hind tibia straight, not 

 provided with a keel-like brush of short hairs on flexor side at apex, 

 but with a long calcar below middle and on outer side a fairly regu- 

 lar row of cilia. 



Wings distinctly brown, the fourth vein converging toward third 

 precisely as in H. dentipes. 



Female. — Front with the usual cruciate bristles. Parafacials col- 

 ored as in the male, but a little wider. Thorax as in male. Abdo- 



