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 cyhndric 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 tegulse 

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

 tibiae at their base and apex are spotted with AA'hite pubescence, 

 the scutellum very broad, slightly jjroduced 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 jnibescence, the sixth having 

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

 apical margin transverse, slightly produced in the middle ; all 

 the segments exce])t 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 tegulae and scutellum tes- 

 taceous, the ai)ical margins of the segments of the abdomen rufo- 

 testaceous ; the seventh segment armed laterally with an elongate 

 stout acute spine, the S2)iues grooved exteiiorly ; also a central 



