AKT. 19 AMEKICAN MUSCOID FLIES ALDRICH 31 



deep notch ; while in dorsalis there is a single median process bearing 

 two tufts of setules close together. The North American species 

 studied by me in my pa])er on Cylhidronii/ia^^ included none with 

 two lateral pairs of scutcllar bristles and no apicals, and doi'saJis is 

 not now represented in tlu' T'uitcd States National Museum. 



Genus LEPIDODEXIA Brauer and Bergenstamm 



Lepidodex^ia Brauer and Bergknstamm. Zwell. Kais. Mus., pt. 5, 1891, pp. 373, 



379; pt. 6, 1893, p. 133. 

 Rdimondi-a Townsend, Proc. IJiol. Soo. Wash., vol, .30, 1917, p. 47. 



The type species of Lepidodexia is tetraptera Brauer and Bergen- 

 stamm; that of Rahnondia is unihuasi Townsend, a closely related 

 species. Both were described in the aboA'^e references. 



132. LEPmODEXIA TETRAPTERA Brauer and Bergenstamm 



Lepidodexia tetnii>tcra Buaier and Bergenstamm, Zweitt. Kai.s. Mns., pt. 5, 

 1891, p. 379; pt. 6, 1893, p. 133. 



One male, the type and so marked, from ''Lindig, 1864. Venezuela." 

 Male (fig. 2). — Head somewhat globose with the front prominent, 

 antennal axis scarcely longer than vibrissal ; cheek about two-thirds 

 the eye height in side view, its posterior part rather bulging so that 

 the eye has an oblique position. Front 0.15 of head width by microm- 

 eter at the naiTow-est place just before the ocelli; frontal bristles 

 about 15 of imiform size, tlie upper scarcely reclinate, the lower 

 iiardly reaching the middle of the .second antennal joint. Frontal 

 -fripe velvety brown, before the ocelli more than twice as wide as 

 (ither parafrontal. the latter with the parafacials have a satiny 

 l)i'ownish-yellow color. Where the parafrontals Aviden anteriorly 

 llicv bear numerous small hairs Avhich extend down on the parafacial 

 to tlie transverse impression, which is large and dark red. Antennae 

 Idaek. third joint missing on both sides, said by Brauer and Bergen- 

 stamm to be three times as long as the second Avith tl)e arista long- 

 jilumose on the basal half. Facial carina very distinct, but hardly 

 more prominent than the ridges. Avhich bear good-sized hairs up to the 

 middle. Epistoma much above the lower edge of head, the profile 

 -lo]iing upward very decidedly. l)eloAv the vibrissae are about ,six 

 ijristles in a single row and a few more on the cheek, boi'dering the 

 low er part of the transverse impression. All the hairs of the he,ad are 

 l»!ack. pali)i black, hairy, of ordinai-y size: proboscis rather small 

 with good-sized labella. Thorax brownish pollino.se *\vith darker 

 longitudinal stripes, the humeri and lower part of pleurae more 

 cineieous. Cliaetotaxy : Acro.stical 0. 1: doisocentral 2, H: liumeral '4', 

 post-humeral 1; presutural 1; supraalar 2; intraalar 2; postalar 2; 



"Proc. U. S. Nat. Mus., vol. 68, art. 23, 192», pp. 1-27. 



