34 Mr. Newman's Descriptive List 



membranous lobe, whlcb is birsute in front ; below tbis birsute 

 membranous lobe is a broad flat corrugated and corneous surface 

 presented to a similar part in tbe opposite mandible, tbese sur- 

 faces meet eacb other in tbe manner of molar teeth : tbe maxillae 

 are of equal length with tbe mandibles ; the galea is incurved, and 

 divided into five acute teeth ; below tbese a small hirsute lacinia 

 is visible ; tbe maxipalpi are four-jointed, the second joint is 

 rather longer than tbe first and third, tbe fourth is longer than 

 tbe second, and nearly cylindrical : the labium is elongate, its 

 lateral margins are convex in the middle, but considerably re- 

 stricted both above and below tbe middle, tbe apex is slightly 

 emarginate ; near its apex, in a lateral cavity on each side, are situ- 

 ated the labipalpi, these are shorter and three-jointed, tbe joints 

 of nearly equal length and bulk: the prothorax is very convex, 

 nearly thrice as broad as the bead, its posterior margin is flexu- 

 ose ; the scutellum is large and triangular ; the meso-sternum is 

 produced in a point, which extends forwards to tbe insertion of 

 tlie fore legs : the elytra are rather wider than the prothorax, dor- 

 sally they are tolerably flat, and posteriorly they are abbreviated 

 and truncated, leaving the terminal portion of the abdomen 

 covered ; the middle and hind tibias have three transverse series 

 of acute spines on their exterior surfaces, tbe apical joint of all 

 the tarsi is long, nearly equalling the other four united : the un- 

 guiculi of the fore and middle legs are of unequal size ; in each 

 pair the larger unguiculus is bifid, those of the posterior pair are 

 nearly equal.* Tbe underside of the abdomen is invariably pilose, 

 except in the first species, P. regina ; this pilosity is often, indeed 

 mostly, confined to the margins of the segments, and is particu- 

 larly apparent along tbe side, giving tbe appearance of a row of 

 whitish spots. I have found that these spots vary exceedingly in 

 tbe same species, and are not unfrequently different on the two 

 sides of the same individual ; this circumstance has led me to be- 

 lieve their appearance dependent in a great measure on the recent 

 or worn state of the specimen, more particidarly as they are so 

 situated as to be constantly exposed to friction from the meta- 

 femora : being therefore dissatisfied with the variations of tliis 

 pilosity as affording specific distinctions, I have in the following 

 descriptions left it entirely unnoticed. 



* Plate 3, fig. 1 a — n, represent the generic details from P. hipunctata. \ a, 

 labrum ; 1 b, mandible ; 1 c, ditto, seen in front ; 1 d, maxilla ; 1 e, labium ; 

 If, antenna ; 1 g, front of body seen sideways ; 1 h, fore tarsus, male ; 1 i, ditto, 

 female; Ik, middle tarsus, male; 1 /, ditto, female j 1 7«, hind tarsus, male ; 

 1 n, ditto, fem lie. 



