NORTH AMERICAN HYMENOPTERA. 299 



Abdomen elongate-pyriform, strongly rugose punctate, rufous marked with black 

 and yellowish ; first segment moderately broad, the suture between it and the 

 second constricted, so that the angle between the first and second segments at the 

 side is about a right angle, not a veiy obtuse angle as in ferrwjata In general 

 shape the first segment might be compared with that of quadriguttdta, having the 

 comparative narrowness which distinguishes that from wickhami, but in qnadri- 

 gutfata the sides of the segment are flattened after the manner of ferrmjnta, 

 whereas in rufosiiffiim they bulge just before the suture; second segment sliining, 

 lively rufous, with black and blackish markings ; a blackish triangle, owing its 

 color to appressed black hairs, has its apex cut off by the anterior border of the 

 segment, and its base about the middle of the- segment prolonged at the angles 

 obliquely downward and hindward in the form of a suflused and finely evan- 

 escent horn. Looking at the insect with the head downwards, the triangle and 

 its prolongations resembles in form the skull of an ox — or better, a gayal — with 

 the nose cut of and the horns shadowy. Below the base of this triangle the color 

 of the dermis shows as" a broad rufous band, with the slightest indication of a 

 dark middle line, such as may sometimes be seen in ferriujata : the iwsterior mar- 

 gin of the segment is broadly black, with a yellowish dot medially ; this black 

 margin is replaced at the middle of the sides by a yellowish fringe, which is con- 

 tinued beneath; the third segment, so far as visible, is colored like the black 

 margin of the second, with the central yellowish spot and the yellowish fringe 

 beneath ; the fifth and sixth are covered with yellowish or golden pubescence, 

 and the last, as the sixth beneath, is black. 



Hab. — Guanajuato, Mexico (Dr. A. Duges) ; one specimen. 



This sjjecies is not very near to anything we have seen. The pale 

 thoracic band, witli black above and below, suggests the condition 

 of affairs in dugesii ; whereas the abdominal markings faintly sug- 

 gest quadriguttata, the portions left rufous corresponding to the four 

 spots of that insect, at least to some considerable extent. If, as was 

 argued when pruaotineta was described, dugesii is derived from more 

 or less hairy types such as pnmotiiicta ; it appears probable that 

 quadriguttata and ferrugata represent even a later stage of evolution 

 than dugesii, though in a different line which may be indicated bv 

 such a species as nifmnffasa. 



Prosopis asiniuiis n. sp. '^ .—About 5 mm. long; black, with yellowish 

 white markings. Head and thorax strongly punctured; metatborax truncate, 

 rugulose; mandibles strongly bifid; the inferior margin of the elypeus is brown, 

 but otherwise it and the rest of the face below the level of the insertion of an- 

 tennae is yellowish white; the yellowish white continues on the sides of the face 

 above the level of the antennae about as much as the length of the scape, ending 

 in an obtuse point at an angle of about 50° : the face markings, taken altogether, 

 strongly suggest the head of a donkey, with erect ears, hence the specific name ; 

 scape broadened, truncate : flagellum dark brown ; collar and tubercles yellowish 

 white: tegulte pale. Femora black, more or less pale at distal ends; tibiae yel- 

 lowish white, the four posterior ones ringed with black about their distal halves ; 

 tarsi yellowish white, terminal joints brownish. Wings hyaline, nervurcs and 

 stigma piceous ; recurrent nervures uniting with transverse cubitals ; second 

 submarginal cell sligiitly narrowed towards the marginal. Abdomen with the 

 anterior face of the first segment finely pubescent, posterior lateral margins of 

 this segment also finely white pubescent; posterior half of abdomen becoming 



TRANS. AM. ENT. SOC. XXII. AUGUST. 1895. 



