REVISION OF STREPSIPTERA — PIERCE. 95 



Male. — Black, with feet fuscous. Length, 1J lines. Head ante- 

 riorly obsoletely tri-lobed. Antennas six-jointed; first joint longer 

 than second, clavate or obconic, apically obliquely truncate; second 

 very short, cylindrical; third short, inferiorly produced in a long 

 lanceolate, subauriform, compressed flabellum; fourth longer, sub- 

 linear, outwardly a little broader; fifth short; sixth very short, 

 apically rounded, tenuate. Mandibles a little inflated toward apex. 

 Maxillae obconic, compressed; with the palpus semiovate, acute, 

 concave beneath. Eyes large, prominent. Vertex rather flat. 

 Elytra small, sublinear. Wings large, longer than the body, folded, 

 white, with costal margin dark. Postscutellum elongate, covering 

 abdomen. Feet compressed, piceous. a 



From the figures of this species (Kirby, 1806; Smith, 1857) the 

 following may be added: Third joint of antennae laterally not quite 

 reaching sixth; fourth equal to twice fifth plus sixth. 



2. STYLOPS DALII Curtis (1828). 



Stylops melittae dahlii Friese, 1906. 

 Stylops dalii Pierce, 1908. 



Host. — Andrena labialis Kirby, England. 

 Male. — Length 3.5 mm., wing expanse 7.8 mm. 

 The following is Curtis's description: 



Intense velvety black. Palpi with the second joint much smaller than the first. 

 Antennae with the second joint very minute, and the fifth shorter than the sixth. 

 Scutellum at the base and abdomen at the sides ochraceous. Superior wings or 

 elytra fuscous, inferior wings emarginate at the posterior edge and narrowed toward 

 the anal angle; milky white, iridescent, the costa fuscous as well as several of the 

 nervures at the base. Legs fuscous. (Curtis, 1828.) 



a Male. — St(ylops) aterrima; alis corpore majoribus; pedibus fuscis. 



Long. corp. lin. 1£. 



Corpus aterrimum, obscurum. Caput antice obsolete trilobum. (Saunders, 1872, 

 27, from Kirby, 1802.) 



Antennae bipartitse [sexarticulata?], ramis compressis, superiori articulato; stipite 

 biarticulato; articulo primo sequente longiori, clavato vel obconico; apice oblique 

 truncate; secundo brevissimo, cylindrico, ramos duos emittente (sic); inferiori [arti- 

 culo 3tio] paulo breviori, lanceolate et fere auriformi, compresso, exarticulato, supra 

 concavo; superiori compresso, triarticulato; articulo primo [4to] longiori, sublineari, 

 extrorsum paulo latiori; secundo [5to] brevi, tertio [6to] brevissimo, apice rotundato, 

 linearibus, tenuioribus. 



Mandibular apice paulo crassiores. 



Palpi (maxillae) articulo primo, obconico, compresso; secundo semiovate, acute; 

 subtus concavo. (Saunders, 1872, 26, from Kirby, 1813.) 



Oculi magni prominuli, conspicue reticulati, pedunculo brevi, crasso, insidentes. 

 Vertex planiusculus. 



Truncus: Elytra parva, sublinearia, thoracis lateribus affixa. Alse magnae, corpore 

 longiores, plicatse, lacteae, costa lineolaque submarginali, nigricantibus. [Pro-] scutel- 

 lum [postscutellum, Aud.] (this latter is the correct) porrectum, elongatum, calcei- 

 forme, abdomen obtegens; processu corneo utrinque munitum. Pedes compressi 

 picei. Abdomen, sub scutelli tegmine delitescens, camosum, ano truncate, sube- 

 marginato. (Saunders, 1872, p. 27, from Kirby, 1802.) 



