Sphecoidea of Nebraska 53 
Males 4, females 46: Omaha (22), Lincoln (4), West Point 
(1), Mitchell (4), Crawford (1), Glen (10) and Harrison (12) ; 
May to August 22; visits flowers of Chamaecrista fasciculata, 
Mentzelia sp., Solidago sp., Cirsium sp., Medicago sativa and 
Helianthus sp. 
The specimens with the black scutellum, mentioned by H. S. 
Smith, are buccadentis. 
Rhopalum Kirby 
Rhopalum decorum (Fox). 
1895. Crabro decorus Fox, Trans. Amer. Ent. Soc., XXII, p. 200. 
1908. Rhopalum decorum H. S. Smith, Univ. Nesr. Srupies, VIII, 
Pp. 395. 
Females 5: Glen (5); August 13, 1906 (H. S. Smith). 
Solenius LePeletier 
KEY TO THE SPECIES 
Females 
1. Anterior margin of clypeus produced into a strong, truncated process 
PR PINES ACRES Co ar Ad setae Siete Sea ed dia Rete aro 8, bara tial oer E 2 
Anterior margin of the clypeus not strongly produced in the middle, 
ERGO. SOCAL yee Cente aiakee a eae eet aes atece ere OA A cae ia eee 5 
2. Head and thorax very coarsely sculptured, being covered with large 
punctures, the mesonotum, scutellum and mesepisterna frequently 
with strong striations interspersed with punctures; abdomen with 
SErone, «distinctly separateds punectUnes ar rmice ci ak - tiers ce.sisl=l cia, tere 3 
Head and thorax not very coarsely sculptured, the head rather finely 
‘and closely punctured; mesepisterna striated; ocelli forming an 
equilateral triangle; pronotum rounded at the sides, not dentate 4 
3. Punctures of the head extremely large, deep and well separated, those 
on the abdomen also coarse but less so than on the head; spots on 
tergites four and five always separated ................ interruptus 
Punctures of the head strong, but much less than in interruptus, and 
closer, especially between the ocelli and occiput; punctures of the 
abdomen somewhat finer than those of the head; tergites four and 
five: with the spots united mito: bandse <5 2.25. seen svc ole bellus 
4. First joint of flagellum fully as long as the three following united; 
posterior face of propodeum with feebly developed lateral ridges; 
pedicel more’ orsless: yellows 0. ack a areas 's ods oo oie;s oes obscurus 
First joint of flagellum scarcely as long as the three following united ; 
371 
