FERNALD: SPHECIDAE FROM ARGENTINE. 267 



Kohl's dolichoderus came from Chili ; Taschenberg's pumilo came from Mendoza, 

 close to the Andes on their eastern side ; while the specimen now under consider- 

 ation was taken less than three hundred miles farther east and but a little farther 

 north. 



From these facts it seems certain that the distinctions between dolichoderus and 

 pumilo represent individual variations merely, and that the former must be con- 

 sidered a synonym of pumilo. 



Chlorion (Proterosphex) argentinum (Tasch.). 



Two female specimens. Length, 22-24 mm. 



These specimens hardly agree with the descriptions of this species in all regards. 

 The differences are mainly those of color distribution, however, and it is doubtful 

 if they are of great importance. 



The enlarged portion of the first dorsal abdominal plate is black except a narrow 

 posterior and lateral strip of red. On each side of the second dorsal plate is a 

 half-moon shaped black spot, its curved side being posterior. The fourth dorsal 

 plate is black except for a narrow red posterior margin which on the middle line 

 extends into the black in the form of a V. All the other parts of the dorsal plates 

 are red. The surface beneath is red except for two black, rather vaguely limited 

 black bands on the first ventral plate which extend outward and backward from 

 the petiole. 



In his key leading to this species Kohl describes the tibiae as suddenly thick- 

 ened at the end on the inner side. This is somewhat misleading, as, though the 

 end is thickened, it is not suddenly so, his Figure 18 being a better representation 

 than his Figure 20. 



Chlorion (Proterosphex) davisi, sp. nov. 



Female. Black ; wings hyaline except at tip and near base ; large, robust. 



Head large, not quadrate from above, the frons being depressed between the 

 eyes and the cheeks sloping sharply toward the neck. Clypeus and frons densely 

 covered with pale yellow pubescence and long hairs of the same color. Clypeus 

 somewhat arched, its anterior margin evenly rounded except for a small truncated 

 central lobe. Frons quite deeply sunken between the eyes, pubescent nearly to the 

 ocelli, and where bare, showing scattered punctures of medium size. Ocellar area 

 rather faintly limited by depressed lines, the frontal suture evident from the pubes- 

 cence to the anterior ocellus. Vertex narrow from front to rear, bearing scattered, 

 long brown hairs. Distance between the lateral ocelli slightly greater than between 

 them and the eyes. Cheeks about half the width of the eye, widest opposite the 

 middle of the neck and narrowing quickly above and below, glistening, with scat- 

 tered punctures, thicker below, where there are also numerous long dark brown 

 hairs. Inner margins of the eyes about parallel. Antennae black, grayish or 

 brownish sericeous beyond the first filament segment, the scape tinged with ferru- 

 ginous beneath, with a trace of yellowish pubescence at the base and short dark 

 brown hairs on the inner side and tip. Mandibles quite stout, black, with a faint 



