340 Trans. Acad. Sci. of St. Louis. 



Panurgus marginatus Cress. 



Panurgus marginatus Cresson, Trans. Am. Eat. Soc. VII, 62, $, 1878. 

 Panurgus halictulus Cresson, Trans. Am. Ent. Soc. VII, 63, $, 1878. 

 Panurgus autumnalis Robertson, Trans. Am. Ent. Soc. XXII, 121, £, 

 1895. 



Carlinville, Illinois, 27 5, 7 $ specimens; Ks., Col., Utah 

 (Cresson). 



Nomad a Scop. 



NOMADA BELLA CreSS. 



Nomada bella Cresson, Proc. Ent. Soc. Phil. II, 287, <^, 1863. 



? Nomada bella Provancher, Addit. Faun. Ent. Can. Hym., 333, J 1 , 1888. 



5. — Mandibles simple; fourth joint of antennae longer 

 than third or fifth; ferruginous, tips of mandibles, antennae 

 above, middle of face, vertex, cheeks behind, three broad 

 bands on mesonotum uniting before scutellum, pleura beneath 

 wings extending in a broad band on each side of metathorax, 

 broad middle of latter, coxae, trochanters, femora at base 

 behind, hind femora largely, hind tibiae behind and their 

 metatarsi, base of abdomen and apical margins of segments 

 1-3, more or less black ; a spot on each side of segments 2-3, 

 four spots on fourth, and two spots, separated or united, on 

 disc of fifth segment, yellow ; wings a little more clouded than 

 in the male. Length 9 mm. 



Carlinville, Illinois; 2 5, 7 $ specimens; Mass., Ct. (Cres- 

 son). 



Nomada superba Cress. 



Nomada superba Cresson, Proc. Ent. Soc. Phil. II, 281, tf, 1863. 



^. — The spots on pleura and collar often wanting. Length 

 10-13 mm. 



2, — Kesembles the male, the wings more clouded, spot on 

 pleura larger, sometimes another small one present; orbit 

 entirely bordered, or nearly so ; spots on scutellum united, 

 sometimes also in the male a line on post-scutellum; the face 

 and all of the ornaments below largely tinged with rufous, 

 sometimes all of the ornaments are red except the bands of 

 abdomen above ; mesonotum black, or with two or four rufous 

 lines. Length 12-13 mm. 



Carlinville, Illinois; 14 §, 18 $ specimens; Col. (Cress). 



The metathorax on each side is produced into a dentiform 



