1865;] 151 



more or less tinged with ferruginous behind, the posterior pair blackish 

 before; tips of all the tarsi dusky. Abdomen petiolated, strongly sub- 

 fusiform, shining, the four basal segments black above, the first with a 

 yellow band near the tip, deeply indented on the disk in front ; second 

 segment with a rather large sublunular yellow spot on each side about 

 the middle, dilated on each side and nearly reaching the disk of the 

 segment ; third segment black, stained with ferruginous on each extreme 

 side ; fourth segment with a narrow, transverse yellow band interrupted 

 on the disk, the extreme sides stained with ferruginous; remaining 

 segments, as well as the entire venter, ferruginous ; extreme apex 

 slightly pubescent. Length 5i lines; expanse of wings 8 lines. 

 Collection. — Ent. Soc. Philad. One specimen. 



Crabro claviventris. n. sp. 



Black : face, cheeks and pleura silvery : scape of antennae, elypeus, tubercles 

 and most of the four anterior legs, yellow; two bands on abdomen and the ven- 

 ter entirely, fulvous; wings hyaline; abdomen strongly clavate ; hind tibia? 

 much swollen. 



Malt'.. — Black, subopaque; head rather large, quadrate; face, elypeus 

 and cheeks densely clothed with bright silvery pile; elypeus and man- 

 dibles yellow, the latter black at tips ; antennae pale piceous, the two 

 basal joints yellow, the second obscurely so. Thorax: pleura and meta- 

 thorax rather densely clothed with bright silvery pile; the incisure in 

 front of the mesothorax very deep; tubercles and tegulaa yellowish, the 

 latter tinged with ferruginous; metathorax with a rather deep central 

 excavation on its posterior face. Wings hyaline, beautifully iridescent ; 

 apical margins slightly dusky. Legs yellow ; the four posterior coxte, 

 except tips, and the posterior legs, except base and tips of their tro- 

 chanters and base of their tibiae, blackish ; tips of intermediate femora 

 and middle of their tibiae, dusky ; posterior tibiae very much swollen 

 beyond the basal fourth, which is very slender. Abdomen elongate, 

 very slender at base, and very much swollen at tips, shining; first seg- 

 ment long, basal two-thirds cylindrical, swollen at tip, black, remaining 

 segments fulvous, the dorsal surface of the second, a large, broad, sub- 

 triangular mark on the dorsal surface of the third and fourth, c.wering 

 their apical half and basal middle, and the entire dorsal surface of the 

 remaining segments, black; venter entirely fulvous. Length 2i lines; 

 expanse of wings 4 lines. 



Collection. — Dr. J. Grundlach. One specimen. 



This curious little species seems to belong to the subgenus Rhopahun. 

 and may be at once recognized by its strongly and suddenly clavate 

 abdomen, and the much swollen hind tibiae. 



