March, 1910.] BrUES : PARASITIC HyMENOPTERA. 19 



are very similar to those of Mystrocncmis. On the other hand it 

 shows many resemblances to certain Pompilid^e of the group Homo- 

 notini, but differs in having a very strong ventral constriction between 



Fig. 4. Algoa heterodo.ra, new species ; female. 



the first and second segments like certain Cosilidas (Sicrolomorpha) 

 which it also approaches in the form of the head showing a connec- 

 tion between Mystrocnemis and its allies and the Cosilidse. 



Parascleroderma nigra, new species. (Fig. 5.) 



Female. — Length 2.3 mm. Black, with a bluish cast, especially on the 

 head; scape and pedicel of antennse honey yellow; basal four joints of flagellum 

 and tarsi brownish. Head very flat, widest just behind the eyes where it is 

 half as broad as long, slightly narrowed toward the rounded posterior angles ; 

 its upper surface shagreened. Eyes very small, oval, bare, placed near the 

 lateral margin of the head, close to the anterior angles. Head just behind the 

 insertion of each antenna with a rounded tubercle about the size of the eye, 

 the space between these anteriorly regularly excavated. Antennse 13-jointed, 

 slender, scarcely twice the length of the head; scape elongate, thickened 

 apically, as long as the four following joints. Pedicel a little longer than the 



