POMPILTJS. 209 



of the clypeus in P. interruptus is described as " truncated," while in P. halteolus it is 

 rounded, with a slight but distinct incurvation ; P. interruptus, moreover, is stated to 

 have the third cubital cellule " subtriangular " and " large." 



\/ 



59. Pompilus halteolus. 



Rufo-fulvus, flavo-maculatus ; pleuris nigris, flavo-maculatis ; pedibus flavis, coxis, femoribus apiceque tibiarum 



posticarum nigris ; alis fumatis. 

 Long. 12-13 millim. 



Hah. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith), North Yucatan 

 (Gaumer). 



Brownish-fulvous ; the orbits of the eyes, a spot on either side of the base of the 

 pronotum, the apex of the pronotum broadly, a broad line on either side of the 

 scutellum, a thin line at its apex, the postscutellum, and the apical half of the median 

 segment, bright yellow ; the pleurae, scutellum, and base of the median segment black ; 

 there is a yellow mark below the tegulae and a larger one below this; there are two 

 yellow marks on the base of the abdomen and the abdominal segments are yellow at 

 the apex ; the coxae, trochanters, and femora (except at the extreme apex) are black ; 

 the apical third of the hind tibiae is black; the apices of the tarsal joints are fuscous; 

 the rest of the legs fulvous, mixed with yellow ; the antennae are fulvous, with the six 

 apical joints black. Eyes distinctly converging at the top ; the hinder ocelli separated 

 from each other by a less distance than they are from the eyes ; the clypeus short and 

 broad, the sides rounded, the apex slightly incurved ; the clypeus and cheeks with a pale 

 pubescence. Prothorax as long as the head, the apex angled bluntly, the sides flat ; 

 there is an impressed line down the centre of the pronotum. Scutellum short and 

 broad, not narrowed towards the apex. Median segment with a gradually rounded 

 slope to the apex, which is margined, the margin projecting at the sides. Abdomen 

 subsessile, hardly longer than the head and thorax united ; the pygidium black and 

 rough, and with some black hairs ; the ventral surface may be black entirely or have 

 bright yellow marks. Legs longish, stout, bearing a pale pubescence ; anterior tarsi 

 with long spines, beneath ciliated ; the tibial spines and the spines on the hind tarsi 

 longish ; the long spur of the hind tibiae about tw T o-thirds of the length of the meta- 

 tarsus ; the hinder tarsi spinose beneath ; all the claw 7 s with a basal tooth. Wings 

 smoky-fuscous ; the basal nervure interstitial ; the third cubital cellule above and 

 beneath shorter than the second, above much narrow 7 ed, the cubital nervures running 

 almost parallel; in the hind wings the anal nervure is received beyond the cubital 

 nervure. 



In structure, it is difficult to find any characters to distinguish this insect from 

 P. flavojpictus ; but as the coloration is quite uniform in the specimens from the 

 localities cited, P. halteolus is doubtless a good and distinct species. 



biol. CENTE.-AMEE., Hymenopt., Vol. II., September 1893. 2 ee 



