56 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.79 



cubital and subdiscoidal ridges present, but hairs inconspicuous, 

 basal third of wing lacking pattern of long hairs usually present in 

 this group ; abdomen mostly bare, sparsely to moderately hairy from 

 middle to apex, surface unsculptured and shiny. 



Male. — ^Length 4 mm., form more slender than female, colored like 

 female, except ocellar area and nota of thorax are more largely black, 

 pronotal band narrower than that of prescutum, both scapulae and 

 axillae tipped above with black, and middle of outer faces of hind 

 coxae black ; pedicel and abdomen above darkened. 



Vestiture and sculpture including malar space and cheeks not 

 different from female, scape as long as pedicel, Fl and half of F2 

 combined, Fl one-third longer than each of F2 to F4 and not much 

 shorter than pedicel, F2 to F4 about equal in length and each 

 one-fifth longer than wide, mesopleura coarsely aciculate and punc- 

 tate as in female ; submarginal vein with about 17 setae, surface ves- 

 titure of wing perhaps slightly coarser than in female. 



Type locality. — Fort Collins, Colo, 



ry;?^.— Female, U.S.N.M. No. 20867. 



Redescribed from all the material cited herewith. 



Remarks. — The type and one female and two male paratypes were 

 obtained by C. F. Baker as parasites of the yucca moth, Prodoams 

 quinquepunctellus Chambers {decipiens Riley) on Septeml>er 19, 

 1893. A few additional specimens of both sexes from the same 

 place, date, and host, and labeled " Colo., 1231," and a female reared 

 by Chas. F. Hicks in Boulder County, Colo., April 30, 1926, from the 

 above species of yucca moth, are in the National Museum collection. 

 The sjoecies is also represented by material bearing No. 3059", 

 19/5/84 and 12/5/84, reared on these dates from Prodoxus y-inversu>s 

 Riley on pod of yucca from New Mexico brought to the Bureau of 

 Entomology of the United States Department of Agriculture on Ma^J 

 11, 1883, by Prof. D. C. Chapman, of Washington, D. C. Two fe- 

 males labeled "Colo., 1777" belong to the Illinois State Natural 

 History Survey collection, Urbana, 111. 



21. DECATOMA BREVILOBAE. new species 



Plate 2, Figure 21 



Similar to varians Walsh in the number of setae on the submar- 

 ginal vein, and in colors, but readily distinguished by its much nar- 

 rower and curved wing band, the shorter and broader form of the 

 head, and the smaller size of the body. 



Female. — Length 2.3 to 2.8 mm., mostly 2.4 mm., mostly black and 

 yellow to reddish brown; head yellowish to reddish brown, some- 

 times two spots on forehead, vertex from antennal scrobe, and occiput 

 black; antennae light brown, scape and pedicel dull yellow, latter 



