14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 10/ 



25. 

 PSEN EQUESTRIS. 



Order Hymenoptera. Fam. Larradae Lat.y Leach, 



Type of the Genus Trypoxylon atratum Fab. 



PsEN Lat., Jur., Panz. Trypoxylon, Pelopaeus Fab. 



Antennrr \nsciie.d near the centre of the face, clavate, curved, 

 smooth, 12-jointed in the female, 13-jointed in the male j first 

 joint large, second small, terminal joint ovate. (I.) 

 Lahrum exserted, transverse, subrotundate before, entire, ci- 

 liated. (2.) 



Mandibles slender, scarcely arcuated, unidentate internally. (3.) 

 MaxilUe coriaceous, divided transversely, terminal process nearly 

 membranaceous, rounded and ciliated : Palpi elongated, un- 

 equal, C-jointed j first joint very small, third largest, sixth slen- 

 der. (4.) 



Mentum large, dilated in the centre, hairy (5. a.), (the point to 

 which the maxilla is attached is shown at e.) : Paljn long, 4- 

 jointed, first joint long, second and third short, last robust, 

 ovate, (b.) 



Lip short, with the edges conniving internally, (c.) 

 Clypeus subrotundate, anterior margin elevated. Head transverse, as 

 broad as thorax, with a tubercle between the antenna!. Eyes oval^^ 

 entire, remote. Ocelli 3, inserted on crown of head in a triangle. 

 Thorax short, nearly ovate. Scutellum narrow, small. Abdomen 

 ovate-conic, with an elongated, abrupt peduncle. Superior wings 

 with one inarginal cell, not extending to the apex, and three perfect 

 submarginal cells, the middle one nearly trigonate, either receiving 

 one or two recurrent verves. Inferior wings ivilh two complete basal 

 cells, heg^ rather small. Tih'iiB spined. Tarsi o-jointed,frst joint 

 nearly as long as the three following, last terminated by simple claws 

 and pulvilli. (8. afore leg.) 



Equestris Fab. Syst. Piezatorum, p. 182. n. 6. 



Black : clypeus and face silvery with hair, shining ; first seg- 

 ment of abdomen rufous, with a black spot at its base ; second 

 entirely, and third partly, rufous. Wings hyaline, iridescent. 

 AntennjB rufous beneath. Thighs and coxae black. Tibia; and 

 tarsi pale ferruginous, the former annulated with black. 



In the Cabinets of Mr. Haworth and the Author. 



This pretty little species I took flying near Lyndhurst in the 

 New Forest the end of August 1822. Mr. Haworth has also 

 tiiken it in the neighbourhood of London. My .specimens per- 



FiG. 7. — Facsimile of page from first edition. 



