10 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 70 



mesopleural region black; whole pleural and sternal region hairy, 

 punctate, sometimes minutely striate. Metathorax black except 

 metanotum, which has a linear transverse yellow spot; upper and 

 anterior part of metapleural region striate, the part just below 

 almost entirely smooth and without hairs; posterior part of meta- 

 thorax somewhat punctate and slightly striate, not very definitely 

 marked off above from the propodeum. 



Propodeum : Hairy, punctate and striate ; black, usually with three 

 yellow spots, one on each side anterior to the spiracle, and one at 

 the end above the petiole, this spot varying somewhat in size, but 

 usually covering the entire end of the propodeum and extending 

 forward a short distance along each side. 



Abdomen: Petiole smooth, nonpunctate or only faintly punctate, 

 minutely sericeous, black, sometimes with ventral part yellow to 

 brown; main portion of abdomen ovate, pointed at apex, black ex- 

 cept first dorsal segment, which usually has an irregular yellow 

 area; smooth, and no more than slightly sericeous except the last 

 dorsal and ventral segments, which are sparsely hairy and punctate. 



Legs : Anterior four : coxae black, trochanters black with a yellow 

 to brownish apical rim behind; femora black proximally, yellow 

 distally; tibiae yellow; tarsi yellow at base, the outer segments be- 

 coming fuscous. Hind legs : almost entirely black ; trochanters with 

 yellow to brown apical rim on lower side; tibiae with yellow streak 

 on lower surface basally ; tarsi usually black, but sometimes fuscous, 

 with first segment or two ferruginous below. Coxae and trochanters 

 of all legs sparsely hairy; entire surface of legs more or less seri- 

 ceous ; tarsal claws fuscous, with a very minute tooth near the middle 

 on the inner surface; spines on legs varying in color from yellow to 

 fuscous. 



Wings: Transparent with a yellowish or brownish tinge, often 

 with a violet or purple reflection ; outer margins slightly inf uscated ; 

 larger veins ferruginous to fuscous. 



Male. — Differs from female as follows : slightly smaller ; abdomen 

 shorter and less acute; teeth of clypeus a little longer and less 

 broadly rounded than those of the female; sometimes a spot of 

 yellow on the outside of the posterior trochanter. 



Genitalia : Somewhat similar to those of caementarmm., but the tips 

 of the uncus taper and curve more gradually, the extreme tips point- 

 ing horizontally outward at about right angles to the main axis 

 of the genital structures. 



Length. — Female, 20 mm. to 25 mm. ; male 17 mm. to 22 mm. 



Habitat. — The extreme southern part of Texas, Mexico, Central 

 America, the West Indies, and the northern part of South America. 

 It is impossible to determine the exact southern limits of this species, 

 since the females are indistinguishable from those of ■flguhim., the 



