AKT. 1 NEW TWO- WINGED FLIES EEOM CHINA ALDEICH 6 



Twenty of the Sacramento paratypes are returned to the California 

 Department of Agriculture. 



l\jpe.— Male, Cat. No. 26865, U.S.N.M. 



XANTHOTRYXUS, new genus 



Near Pollenia, from which it differs especially in having the para- 

 facials bare, and the face with a broad keel. 



Hypopleural bristles present, postscutellum not developed; pro- 

 pleura and prosternum bare ; e3'es bare ; vibrissae as high above 

 oral margin as in PoJJenia rudls, but farther apart; facial ridges 

 with only a few setules above vibrissae; palpi normal, proboscis 

 short, with ordinary labella ; antennal axis and vibrissa! axis about 

 equal in length; frontal bristles reaching oidy to base of antennae; 

 arista plumose. Thorax with dense deciduous curly pale hair ; hind 

 calypters bare, large. Abdomen robust, first sternite pilose, dense 

 hair of dorsum becoming bristlelike apically. Wing with apical 

 crossvein, the first posterior cell ending distinctly before apex : third 

 vein with a few very delicate pale hairs above and belovv' at base ; 

 subcostal sclerite with a tuft of yellow hairs; stem vein bare. 



Genotype. — Xanthotryxus mongol, new species. 



XANTHOTRYXUS MONGOL, new species 



Black with dense appressed golden deciduous hair on thorax, 

 the abdomen with dense golden pollen covering dorsum and becom- 

 ing gray underneath. 



Male. — Front narrow above, at narrowest hardly wider than dis- 

 tance across hind ocelli, thence rapidly widening and the face wid- 

 ening at same angle; parafrontals, parafacials, and upper part of 

 face golden pollinose, lower face and cheek more gray ; frontal stripe 

 triangular, wide anteriorly, brown. Ocellars normal, proclinate, no 

 large verticals nor reclinate frontals. The single row of convergent 

 frontals begins some distance from the anterior ocellus and consists 

 of about 15 bristles. Antennae black, third joint rather slender, 

 twice the second; arista pale except at base, of moderate length, 

 plumose almost to tip. Palpi black. Beard yellow, hairs of cheek 

 black, cheek three-fourths of eye height. 



Thoracic chaetotaxy : acrostichal 2, 3; dorsocentral 3, 4; humeral 

 3 or 4; posthumeral 1 (inner) ; presutural 1 (so far forward it might 

 be called posthumeral); notopleural 2; supraalar 3; intraalar 2; 

 postalar 2; sternopleural 1, 1; scutellum with 2 lateral, apical of 

 same length. Postalar declivity with large tuft of yellow hairs; 

 hind calypters brown, front ones yellow^, the long pile at junction 

 yellow. 



