ACROCERID FLIES — SCHLINGER 365 



long as tarsal segment IV; wing with sLx posterior cells, anal vein 

 widened apically, m crossvein 2}^ times r-m crossvein. 



Abdomen: Long, narrow, somewhat sunken from loss of eggs; 

 stigmata of segments II-VI free in intersegmental membrane. 



Holotype: Female: Alto Itatiaia, Rio de Janeiro, Brazil, altitude 

 2,000 meters, March 1941 (R. C. Shannon), USNM 62979. 



Remarks: There is some question in my mind as to whether this 

 species belongs in Pialea. It is closely related to lutescens, judging 

 from the latter's description, and shares with it such characters as 

 strong wing venation with a widened anal cell and six posterior cells, 

 the large antennal tubercle, and the same type of antennae, including 

 the weakly fused first segment as figured by Wandolleck (1914, pi, 1, 

 fig. 16) for lutescens. It would be interesting to know if lutescens 

 has the same tarsal structure as antiqua, or whether it is more like 

 lomata. As stated previously, these two species may form a distinct 

 genus, but, in the absence of more material and definite males of both 

 species, it seems better to place lutescens and antiqua in Pialea at 

 present. 



Pialea lutescens Westwood 



FlGURK 2,C 



Pialea lutescens Westwood, 1876, pp. 513-514, pi. 6, fig. 2 and details. — Bezzi, 

 1912, p. 78.— Brunetti, 1912, p. 474; 1920, pp. 160-163. 



I have not examined any specimens of this species, and apparently 

 the only known specimen is the type, which I deduce from Westwood's 

 drawings to be a female. 



The characteristic features of lutescens as gleaned from the original 

 Latin description and the figures presented by Wandolleck (1914) 

 are as follows: Entire body clay-yellow, somewhat pubescent; dorsum 

 of thorax more yellowish, with two lateral black vittae; antenna 

 deflexed, last segment somewhat compressed, all segments with some 

 pUe; wings with six nearly complete posterior cells, only fu'st and fifth 

 complete, anal cell widened apically. 



Wandolleck's (1914, pi. 1, figs. 16, 17; pi. 3, fig. 2) figures of lutescens 

 seem to be more accurate than Westwood's, as the latter showed 

 slight variation in the wing venation in his two figures of the same 

 specimen. It may be assumed that Wandolleck's drawings were 

 made from the type, as he had access to the Hope Museum Collec- 

 tion, where the type is now located. 



This species is related to antiqua as discussed under the latter 

 species. Both of these species appear to be as close to Stenopialea 

 beckeri Speiser from Capeland, South Africa, as to any known Pialea 

 species. The only locality data known for lutescens is "Brazil." 



