Dec. 1899.] COQUILLETT : On NoRTH AMERICAN TrYPETID/E. 267 



costa, and the hyaline space between it and the next ray is also almost quadrangular 

 and nearly as large as the first ray ; the latter is almost separated from the brown of 

 the small crossvein, the first basal cell being hyaline along its hind edge almost to its 

 extreme apex ; length, 3 mm. 



Habitat: Colorado. A single male collected by Mr, C. F. Baker, 

 Type No. 441 1, U, S. Nat. Museum. 

 Urellia radifera, sp. nov. 



1 Jitters from stigviatica as follows : Third joint of antenna- slightly oblique at 

 the apex, scutellum bearing only two bristles, middle femora each bearing several 

 bristles on the under side beyond the middle, black spot of wings sends out only four 

 rays none of which extend to the stigma nor to apices of third and fourth veins, and 

 none cross the discal cell, stigma yellowish hyaline ; length, 2.5 mm. 



Habitat: Tucson, Ariz. A male specimen collected April 21, 

 1897, by the late Mr. H. G. Hubbard. Type No. 4412, U. S. Nat. 

 Museum. 



As the table of genera given in Williston's manual is somewhat de- 

 fe( tive (^Epochra is placed in the section in which the distal portion of 

 the wing has two hyaline indentations of which the posterior one is 

 in the second posterior cell, while none of the species are marked in 

 this manner, and Eutreta is located in the group having the face 

 spotted, although four of the five known species have it wholly un- 

 spotted), I subjoin a new table of the genera of this country north of 

 Mexico. Three of the genera, CEdicareiia, Acidogona and Xenochceta, 

 are known to me only by the descriptions and figures : 



1. .Small crossvein noticeably beyond middle of discal cell 6 



Small crossvein near or before middle of this cell 2 



2. F"irst vein not abruptly curved backward near its apex, stigma much longer than 



wide 3 



P'irst vein near its apex abruptly bent backward parallel with apical portion of 

 the auxiliary, stigma subquadrate, as wide as long Stenopa 



3. Third vein bristly at least almost to small crossveins 4 



Third vein bare Rhagoletis 



4. Last section of third vein strongly bowed upward 5 



Last section of third vein straight CEdicarena 



5. Apex of antennas produced in the form of a sharp tooth at the lower front 



angle Zonosema 



Apex of antennae rounded Spilographa 



6. Scutellum not swollen, its upper surface nearly flat 8 



Scutellum strongly swollen, wings banded 7 



7. Upper side of scutellum strongly convex, third vein bare CEdaspis 



Upper side of scutellum almost flat, third vein bristly Peronyma 



8. Front and scutellum destitute of yellowish spines in addition to the usual 



bristles 9 



