158 Annals Entomological Society of America [Vol. IV, 



The red legs, uniform red thorax and enlarged hypopygium 

 are characteristic. 



Specimens are at hand from Ohio, Arkansas, Kentucky, 

 New Mexico and Massachusetts. Others record it from 

 North Carolina and New Jersey in addition. 



The species appears to be partial to bare sandy areas such 

 as are present along lakes, seas and rivers and in semi-arid 

 regions. The larval and pupal stages are passed beneath the 

 surface of the ground, and the pupa case is left partially pro- 

 truding when the adult issues. 



Proctacanthus rufiventris Macquart. 



Total length 30 to 35 millimeters. This species is very much like 

 rufus in coloration. In fact the only noticeable difference between the 

 two is to be found in the markings of the thorax and the male genitalia. 

 In most specimens of rufiventris the thorax is marked with dark, nearly 

 black stripes and spots. The hypopygium is small, narrower than the 

 last abdominal segment and the appendages from dorsal view are 

 narrow for their entire length, short and rounded at the tips. 



Specimens at hand from Louisiana, North Carolina, and 

 Texas. Others record it from San Domingo, Honduras, and 

 Porto Rico. 



Proctacanthus fulviventris Macquart. 



Total length 25 to oil millimeters. Mystax and beard bright yel- 

 low, palpi black with yellow hair, proboscis and antennae black. Thorax 

 black, seutellum with numerous yellow bristles and hairs: wings pale 

 brown, femora clear black, tibiae red, except the apex of each which 

 may be 1 ilack, tarsi black or in some specimens the hind metatarsi are red . 

 Abdomen black at the base, partly red posteriorly. Different individuals 

 are colored differently. In two specimens before me the female abdo- 

 men is clear black except the dorsum of segments three to seven inclu- 

 sive which is red, while in the male the segments beyond four are red, 

 as is the dorsum of three and four, while the venter of the first four seg- 

 ments and the dorsum of the first two are practically all black. Male 

 < i 'i, ilia small, appendages much shorter than the last two abdominal 

 segments, each widest at the base and gradually narrowed towards the 

 apex which is rounded. 



The small male genitalia together with the clear black 

 femora and red tibia characterize the species. 



The specimens before me are from Florida and records do not 

 show that it has been collected in any other locality. 



