Art. 2.T GENUS CYLIXDROMYTA MEIGEN ALDRTCH 23 



Sternopleurals three; in the male the posterior forceps are soft and 

 rather short, somewhat thick in profile, united and deeply grooved 

 behind, varying in color from almost white to brownish. The ante- 

 rior forceps are the most characteristic feature of this species, being 

 rather broad at base and still more so toward the apex, where they 

 are almost obliquely truncate, with a rounded point on the front 

 edge; the fifth sternite has a notch in the middle separating two 

 small lobes and beyond these at the sides two or three somewhat 

 flattened small bristles. On the venter close to the middle line there 

 are two or three pairs of bristles on the hind corners of the tergite of 

 the second segment. In the female the hooks at the tip of the last 

 genital segment are directed more straight forward than in other 

 species and there is no shoulder at their base. The abdomen is 

 destitute of groups of special short spines on the venter. 



Length, 7 to mm. 



Described from 26 specimens of both sexes. 



In the National Museum are 13 specimens, from Bethayres, Penn- 

 sylvania (Harbeck) ; Rock Creek, District of Columbia (Town- 

 send) ; East Falls Church, Virginia (Rohwer) ; Chesapeake Beach, 

 Maryland (Shannon) ; Beaver Creek, Montana (Hunter) ; Brock- 

 ton, Montana (Sperry) ; Boulder, Colorado (Cockerell) ; Pueblo, 

 Colorado (Wetmore) ; Northern New Mexico (Weese) ; Socorro, 

 New Mexico (Williston) ; Maxwell, New Mexico (Barber) ; Mouth 

 of Bear River, Utah (Wetmore), and Rocky Ford, Colorado, pu- 

 parium found in beet field (McMillan). 



In C W. Johnson's collection are 5 specimens, from Cohasset, 

 Massachusetts (O. Bryant) ; Anglesea, New Jersey (Johnson) ; and 

 Colorado (Baker). 



In the California Academy of Sciences are 3 specimens, from Gar- 

 field and Saltair, Utah, and Panoche Hills, Western Merced County, 

 California, all collected by E. P. Van Duzee. 



In the Kansas collection are 5 specimens, from Douglas County, 

 Kansas (Snow) ; Beaver Creek, Montana (Hunter) ; Creede, Col- 

 orado (Hunter) ; and New Jersey (Johnson). 



7'ype.— Male, Cat. No. 28284, U.S.N.M., from Chesapeake Beach, 

 Maryland. The allotype female is the one from Rock Creek, Dis- 

 trict of Columbia. 



The puparium of the Rocky Ford specimen, a female, was figured 

 by Greene under the name Ocyptera carolinae. I correct the identi- 

 fication from the adult. 



CYLINDROMYIA SIGNATA Townsend 



(Fig. IS) 



Apinocyptcra signata Townse?.d, Insecutor Ins. Meust., vol. 3. 1915, j). 94. 



This is a large dark, tropical species, known only in the female, 

 which has very peculiar genitalia. Parafacials silvery, the para- 



