218 HYMENOPTERA. 



Genus 15. SERAPIS, n. g. 



Serapis, F. Smith's MSS. (Details, Plate IX.) 



Head about the width of the thorax, the ocelli placed in a 

 curve on the vertex ; the maxillary palpi two -jointed, the basal 

 joint short, much wider than the second, but not more than half 

 the length ; the second joint cylindric and furnished at its apex 

 with two stout setae, which are about two-thirds the length of 

 the joint ; labial palpi four-jointed, the two basal joints elongate, 

 the two apical ones minute; the labrum elongate, truncate at 

 the apex. The anterior wings having one marginal and two sub- 

 marginal cells, the former about the length of the two latter; 

 the first submarginal cell receiving the first recurrent nervure 

 about one-fifth distant from its apex -, the second recurrent ner- 

 vure uniting with the second transverse cubital nervure ; the 

 abdomen furnished beneath with a dense scopa. 



1. Serapis denticulatus. , B.M. 



Female. Length 5 lines. — Black, the face and cheeks densely 

 covered with white pubescence, on the vertex it is more thinly 

 scattered ; the mandibles slightly bent and armed at their apex 

 with a long acute tooth, on the inner margin are four short acute 

 teeth, the basal one stoutest. Thorax, in front, on the sides and 

 beneath, densely clothed with white pubescence ; two small tufts 

 of snow-white pubescence on the prothorax, one on the tegulae 

 posteriorly, and two at the base of the scutellum ; the posterior 

 tibiae at their base and apex are spotted with white pubescence, 

 the scutellum very broad, slightly }iroduced over the base of the 

 abdomen, the thorax on each side of the scutellum produced into 

 an acute angle. Abdomen, the basal segment has on each side 

 a tuft of white pubescence, the four following segments have 

 laterally a short fascia of snow-white pubescence, the sixth having 

 an ovate spot, and in the centre a slightly elevated carina ; the 

 apical margin transverse, slightly produced in the middle ; all 

 the segments except the basal one produced at its lateral angles 

 into a short stout acute tooth ; the scopa beneath dense, fulvous 

 in the middle and white at the sides. 



Male. — This sex closely resembles the female, but has the 

 clypeus and mandibles yellow, the latter edentate, acute at their 

 apex ; the pubescence on the face and disk of the thorax slightly 

 ochraceous ; the outer margin of the tegular and scutellum tes- 

 taceous, the apical margins of the segments of the abdomen rufo- 

 testaceous ; the seventh segment armed laterally with an elongate 

 stout acute spine, the spines grooved exteriorly ; also a central 



