1913] Melander — A Synopsis of the Sapromyzidae 79 



Pachycerina omata sp. nov. (fig. 7) 



9 • Length i mm. Largely testaceous, the lower part of the head paler yellow, 

 ocellar prominence and a large round spot in center of face shining black. Base of 

 antennse reddish, becoming black beyond the arista; arista reaching but two-thirds 

 the length of the third joint, loosely plumose, long- above and short-plumose below. 

 Oral margin retracted; proboscis yellow, palpi black. Thorax with the following 

 markings: humeri, scutellum and posterior half of mesopleurse whitish yellow; 

 two transverse bands blackish, one in front of scutellum including the pteropleurae, 

 and another including the front half of the mesopleuraj continuing across the 

 notopleural suture to the mesonotal suture and then broadly interrupted across the 

 disc of the mesonotum. Abdominal segments, except the first, with broad sub- 

 basal black fasciae, interrupted along the median line. Legs yellow, front tarsi 

 dusky, all the tibiae with preapical bristle. Calypteres and fringe yellow, but a 

 dusky spot on the margin. Halteres yellow. Wings hyaline, with a very faint 

 yellowish tinge : anterior cross-vein beyond the end of the first vein, the last two 

 sections of the fourth vein subequal ; last section of fifth vein shorter than posterior 

 cross vein and one-sixth the length of the preceding section. 



Two specimens from Professor Aldrich's collection, received 

 from Mr. Crawford, who collected them at Dona Marcia, Chiapas, 

 Mexico. 



Genus Lonchaea Fallen. 



1. Arista plumose; third antennal joint short, testaceous; legs piceous, tarsi 



testaceous. Mex discrepans Walker. 



Arista bare or short-pubescent 2 



2. Front with a median reddish vitta; venter yellowish, with a broad black 



stripe; legs brown. W. Ind., Ga glaberrima Wiedemann. 



Front and venter not red or yellow 3 



3. Antennfe not reaching the oral margin 4 



Antennae reaching or surpassing the oral margin 9 



4. Legs entirely black or blackish 5 



Metatarsi yellow 6 



5. Metallic black, scutellum more green, abdomen deep metallic green. 1.5 mm, 



W. Ind orchidearum Townsend. 



Shining black, scarcely at all metallic, abdomen thinly covered with brownish 



dust; calypteres with brown cilia. 3 mm. Eur., Alaska, Wash.* 

 deutschi Zetterstedt. 



6. Cheeks bristly; front femora strongly setose beneath; two basal joints of tarsi 



yellow; calypteres yellow; head, thorax and abdomen deep metallic green; 

 front of 9 two times as long as wide, its sides parallel. St. Vine; Cuba, 



Aldrich brevicomis Williston. 



Cheeks hairy, at most with one or two bristles in front; legs not with stout 

 bristles 7 



