140 AMERICAN HYMENOPTKRA. 



Hab. — San Antonio, Texas. 



One rather defective male which would not have been described 

 at this time but for its obvious relationship to 0. yuma. In thora- 

 cic vestiture it is like that species, and so it is in the general type of 

 maculation ; but it is much less irrorate and strigate in appearance, 

 and such markings as are present are not nearly so well defined. 



Stibadiiiin Iiutsoiii n. sp. 



Color a bright olivaceous-gray. Head whitish ; frontal process cylindrical, de- 

 pressed at tip so as to leave a sharp rim, from the central lower margin of which 

 a transversely flattened wedge-like process extends upward and outward a little 

 beyond the rim. Thorax pale olivaceous, vestiture composed of flattened hair; 

 tuftings not marked in the specimens. Primaries olivaceous, with a broad paler 

 median band that does not quite reach the costa ; a narrower pale shade band 

 from outer third of inner margin to apex, a little waved and not so obvious at 

 apex ; an obscure paler shading from hind angle along outer margin to the apex ; 

 in the male traceable to a union with the extra-median pale shade band. Fringes 

 olivaceous. Secondaries uniformly smoky brown. Beneath: primaries almost 

 uniformly smoky; secondaries whitish, with an ochreous tinge. 



Expands .80-85 inches = 20-22 mm. 



Hah. — Yuma County, Arizona, March 23rd ; Walters Station, 

 California, April 20th. 



One male and one female in fair condition, both taken by Mr. 

 Hutson in the same kind of desert area, though in different States. 

 The rather even olive-green and the obvious, broad, pale median 

 band are characteristic of the species. 



Slibadinni f'liliginossi u. sp. 



Ground color dull, smoky luteous, with a tendency to olivaceous. Head tend- 

 ing to paler, more whitish, frontal structure as in hutsonii. Thoracic vestiture an 

 intermingling of scales and hair, the tuftings defective in the specimens. Prima- 

 ries with a narrow pale band extending from the outer third of inner margin 

 diagonally, nearly to the apex. Secondaries smoky, scarcely paler at base. Be- 

 neath : uniformly smoky, secondaries scarcely paler than primaries. 



Expands .72-.84 inches = 18-22. 



Hab. — Walters Station, California, April 20th ; Phoenix, Arizona, 

 April 1, 1897. 



Five males and four females in fair condition as to wings; but the 

 thorax compressed or with defective vestiture in most cases. All 

 except one female were sent in by Mr. Hutson, the latter from the 

 Hulst collection and much paler than any others. Three females 

 and two males agree strictly with the above description. In one 

 female the outer line is broader, a little less rigid, extends to the 

 apex, and there is a pale marginal band extending the entire length 



