ART. 1 NEW DIPTEEA FEOM SOUTH AMEEICA ALDEICH 13 



Wings dark brown, calypters a little lighter brown; third vein 

 with two hairs at base. 



Length, 4 mm. 



Described from two males collected by F. X. Williams at Tena, 

 Ecuador, February 17, 1923. The paratype is returned to the 

 Hawaiian Sugar Planters' Association. 



r^/pe.— Male, Cat. No. 40980, U.S.N.M. 



The striking and beautiful pattern of the markings is*very similar 

 to Lydellothelaira coUaris Townsend and also like Wiedemann's 

 Zosteromyia dilecta, but these are entirely different in many char- 

 acters. 



DAETALEUS, new genus 



Belongs to the tribe Theresiini, and agrees with the genotype of 

 Theresia {tandrec Robineau-Desvoidy) in having the facial keel 

 slight above, disappearing below; palpi and proboscis of ordinary 

 form ; no discals on first three abdominal segments and no marginals 

 on first two; and in various minor characters. It differs mainly in 

 having the epistoma much more protuberant, and quite strikingly 

 in possessing the metallic color of many Calliphorids. 



Hypopleural bristles and postscutellum well developed. Front 

 not prominent, antennal axis shorter than vibrissal; frontal stripe 

 (male) triangular; only one small pair of verticals, a cluster of 

 proclinate hairs arising from ocellar triangle ; f rentals barely reach- 

 ing antennae, small; parafacials, eyes and facial ridges bare; 

 antennae arising below level of eye middle, third joint twice the 

 second, arista plumose; vibrissae above epistoma, not approximated; 

 back of head not bulging. Calypters bare above. Abdomen short 

 and broad, the sternites concealed, only showing a little of first 

 segment. 



DAETALEUS PUP.PUREUS, new species 



Male. — Front narrow above, before ocelli hardly wider than 

 ocellar triangle and the median stripe reduced to a line; head en- 

 tirely yellow in ground color except upper part of back, and with 

 yellow pollen; palpi and antennae wholly yellow, including arista, 

 which has thin and erect plumosity ; beard yellow in most lights but 

 the shorter hairs changeable. Thorax blackish, the sides and scutel- 

 lum metallic. Chaetotaxy: humeral 3, notopleural 2; posthumeral 

 1; presutural 2 one side, 3 the other in close longitudinal row; 

 acrostichal 0, 2 ; dorsocentral 3, 4 ; intraalar 2 ; supraalar 3 ; postalar 

 2; sternopleural 2, 1; scutellum with 2 large marginals, 1 apicaj 

 and 1 discal, all represented by scars in the type. Calypters of 

 usual size nearly white. Abdomen wholly metallic purple, mostly 



