226 long's second expedition. 



This species may readily be distinguished by the two small 

 bright yellow dots at tip each side of the metathorax, and the 

 bright color of the posterior thighs. It varies considerably in 



BEMBEX Fabr., Panz. 



B. monodonta. — Black ; tergum with dilated, greenish-yellow 

 bands. 



Inhabits Pennsylvania. 



Front and vertex with cinereous hair ; labrum with a greenish, 

 oblong, margined spot each side; near the base ; thorax hardly 

 hairy, anterior edge terminating in a spot on the pleura; an 

 oblicpie, abbreviated line above the origin of the wings, termi- 

 nating in a comma-formed spot behind, greenish-yellow ; meta- 

 thorax, a transverse, rectilinear line at base, and an arcuated one 

 at base, slightly interrupted in the middle, greenish-yellow; 

 thighs, at tip, tibiae and base of the tarsi, pale yellowish ; tips of 

 the latter dusky ; a dilated black line near the tip of the anterior 

 tibiae ; wings hyaline ; tergum with six yellow and green bands, 

 which occupy more than two-thirds of the surface; first band 

 bilobate before, yellow, with a broad green posterior margin; 

 remaining bands somewhat dentated before ; the second and 

 third bands yellow, with a green central dash ; fourth and fifth 

 bands yellow, their anterior margins green ; terminal band en- 

 tirely yellow ; venter entirely black ; a single elevation on the 

 second segment. 



Length % half an inch. 



In the collection of Mr. William W. Wood. [336] 



MONEDULA Latr. 



1. M. 4-FASCIATA. — Black, obscurely iridescent; tergum with 

 four bands, interrupted and narrowed in the middle. 



Inhabits Pennsylvania. 



Antennae with the basal joint beneath yellow; orbits anteriorly, 

 hypostoma and labrum, yellow ; the latter margined each side with 

 piceous, and the hypostoma has a more or less dilated black spot 

 above; mandibles blackish-piceous ; thorax with a capillary line 

 before; wings hyaline, slightly fuliginous, nervures fuscous; 

 metathorax at tip each side compressed and yellow ; pleura with 

 a whitish spot over the anterior feet, and from one to three yel- 



