33% PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



propodeum strongly ridged laterally in female, not at all in male, 

 nigulose dorsally, reticulate punctate laterally, polished behind, 

 spiracle long oval to broadly oval; nervulus interstitial or slightly 

 postfurcal. 



In the rather large series in the United States National Museum is 

 exhibited a wide range of variation in size, structure, and sculpture, 

 and some in color. Females vary in size from 14 mm, to 5 mm. and 

 males from 12 mm, to 7 mm. The smaller specimens have the head 

 thicker from front to back, the thorax shorter, sculpture weaker, 

 and wings paler (sometimes nearly hyaline) than in the larger speci- 

 mens. In some specimens the middle tergites have their apices 

 and posterior corners reddish. A few of the smaller specimens have 

 the hind tibiae strongly infuscated, some displaying a very obscure 

 and poorly defined annulation. The shortening of the thorax is 

 especially noticeable in the mesoscutum, this being distinctly longer 

 than wide in large specimens and distinctly wider than long in very 

 small specimens 



In addition to the type from Texas and the type series of erythropus 

 from various localities in California, specimens of this species from 

 the following States and Provinces are in the National Museum: 

 British Columbia, Washington, Oregon, California, New Mexico, 

 Texas, Colorado. 



Hosts. — Spilosoma virginica (Colorado), Hemileuca maia (New Mex- 

 ico, Webster No, 5054), Malacosoma fragilis (New Mexico), Laspey- 

 resia pomonella (California, Bur, Ent, No, 235), Sabulodes anfractata 

 (California, Bur, Ent, No. 850), Notoloplius oslari (California, Hop- 

 kins U. S. Nos. 4449e, e^, e^, and e^, types of erythropus Viereck). 



EPHIALTES (EPmALTES) PUNICIPES (Cresson). 



Pimpla punicipes Cresson, Proc. Acad. Nat. Sci. Phila., 1873, p. 398, female. 

 Type in Acad. Nat. Sci. Phila., No. 604. Cotype in U. S. Nat. Mus. 



This species, described from Mexico, is included in the present paper 

 on the strength of a determination of a Texas specimen by Cresson. 

 This specimen is in the Academy of Natural Science of Philadelphia. 

 The species, as represented by the National Museum' cotype, is very 

 closely related to sanguineipes (Cresson) and exareolata (Ashmead), 

 being distinguished from the very small specimens of the former 

 species and from the unique type of the latter principally by the 

 characters used in the key. The form of the hind tibia in this and in 

 exareolata, though not conspicuous, is apparantly very characteristic. 

 Other characters of value are: Clypeus truncately emarginate at 

 apex, malar space as long as basal width of mandible; inner margin 

 of eye slightly sinuate; face as broad as vertex; lower margin of 

 antennal foramen far below middle of eye; front rather shallowly 

 concave, polished, weakly rugulose medially; ocell-ocular line slightly 



