2 PEOCEEDIKGS OP THE NATIONAL MUSEUM vol. 76 



a South American genus nearly related, but having the third vein 

 setulose; its type is rufescens Bezzi. 



The principal characters of ProcecidocTiares are the following: The 

 postorbital bristles are flattened and pale in color; the front bears 

 only one upper orbital and two or three lower; there is a pair of 

 dorsocentral bristles immediately behind the transverse suture of the 

 thorax; the scutellum is swollen, globose and polished, and bears two 

 pairs of bristles; the tergite preceding the ovipositor in the female is 

 not shorter than the one before it; first vein setulose, third bare; 

 wing with characteristic and quite uniform pattern consisting of a 

 basal spot and three crossbands, of which the first and second are 

 united in front and the third is oblique, close to costa, and does not 

 extend much behind the fourth vein in the tip of the wing. Wings 

 are figured by Loew, Snow, Doane, and Phillips. The common 

 North American genus Rhagoletis has much the same wing pattern, 

 but is easily distinguished by having the postorbital bristles dark and 

 very slender, and the scutellum not swollen. 



There are so many peculiar characters in Trypeta gihha Loew that 

 I make it the type of a new genus Callachna. 



KEY TO NORTH AMERICAN SPECIES OF PROCECIDOCHARES 



1. Legs wholly yellow 2. 



Legs with femora black 5. 



2. Pleurae and abdomen reddish-yellow; one presutural dorsocentral 



penelope Osten Sacken. 



Pleurae and abdomen black; no presutural dorsocentral 3. 



3. Pleurae shining polita Loew. 



Pleurae pollinose 4. 



4. Front and cheeks wide; antennae small, reaching hardly more than halfway 



to oral margin montana Snow. 



Front and cheeks comparatively narrow; antennae longer, reaching nearly 

 to oral margin flavipes, new species. 



5. With one presutural dorsocentral 6. 



With no presutural dorsocentral 9. 



6. The posterior hyaline spot reaching middle of wing is triangular, widening 



rapidly to hind margin 8. 



The posterior hyaline spot hardly wider at hind edge of wing than at its 

 middle 7. 



7. The mesonotal patch of pale hairs is bounded on each side behind the suture 



by the dorsocentral bristle anthracina Doane. 



The patch of hairs extends outside the bristle grindeliae, new species. 



8. Acrostichal pale flattened hairs in a single or slightly double row anteriorly, 



which widens but little to the suture; abdominal segments with distinct 



black hair on posterior third atra Loew. 



Acrostichal hairs running into a large group before the suture, filling the space 

 between the dorsocentrals; abdominal segments without noticeable black 

 hairs atra, var. australis, new. 



9. Pleurae pollinose except lower part of sternopleura pleuralis, new species. 



Pleurae shining minuta Snow. 



