STUDIES ON LEUCOSPIDINAE C. J. WELD. 



AHcrapion Kriechbaumer, Berl. Entom. Zeitsch., vol. 39, 1894, pp. 315-316. 



Genotype. — MUyrapion bilineatum Kriechbaumer. 

 Exoclaenoides Girault, Mem. Queens. Mus., vol. 4, 1915, pp. 356-357. 



Genotype. — Exoolaenoides uncinctiis Girault. 

 Parexoclaenus Girault, Mem. Queens. Mus., vol. 4, 1915, pp. 355-356. 



Genotype. — Parexoclaenus vespoides Girault. 



Since Schletterer's comprehensive work on this genus in 1890 

 thirty-three new species of Leucospis have been described, only two 

 of which are found in the 

 United States, while twelve 

 of the others occur in South 

 America. Because there is 

 considerable confusion in 

 literature in regard to the 

 structural characteristics of 

 this genus, the following 

 morphological notes and 

 figures are given in the hope 

 that they may help to a 

 clearer understanding of the 

 structure as a whole, as well 

 as being an aid in the use of 

 the key and descriptions of 

 new species included in this 

 paper. 



Head and Thorax. — The 

 head is usually transverse 

 with antennae inserted at 

 about the middle of the facial 

 line as in afflnis (pi. 2, fig. 6) . 

 Sometimes, however, the 

 head is longer than wide, 

 with antennae attached con- 

 siderably above the middle 

 of the facial line, as shown 

 in slossonae (pi. 2, fig. 5). 

 The eyes are more or less 

 sinuate opposite the middle of the scape, the scapal furrows deep, 

 highly polished, and transversely ridged within. The antennae are 

 12-segmented, with the club frequently showing one or two partial or 

 entire sutures near its tip (pi. 1, fig. 4). The mouth parts are well 

 developed, the mandibles 3-toothed, the maxillary palpi 4- and the 

 labial palpi 3-segmented (pi. 2, fig. 8). The thorax is usually shorter 

 than the abdomen, the pronotum large, being nearly as long as the 



Fig. 1. — Diagrams of pronotum op Leucospis. 

 = cayennensis, without any carina ; 6=af- 

 finis, with one carina ; c=guzeratengis, 

 with two carinae. 



