620 APIDJE. 



Genus TETRALONIA. 



Tetralonia, Spin. Ann. Soc. Ent. Fr. vii, p. 538 (1838). 



Type, T. basizoyia, Spin. 

 Banf/e. Both hemispheres. 



Head transverse, not so wide as the thorax ; inner orbits of eyes 

 parallel, ocelli almost in a line on the vertex ; antennae filiform, of 

 extraordinary length in the male ; clypeus subporrect, labrum prom- 

 inent, placed at an angle to the clypens ; labial 

 palpi 4-jointed, maxillary palpi 6-jointed. 

 Thorax broad, depressed ; fore wing with 

 the marginal cell subacute at apex, the apex 

 not approximate to the costal margin ; three 

 cubital ceils, the 2nd the smallest, receiving 

 the 1st recurrent nervure near the apex, the 

 1st transverse cubital nervure oblique, the 

 2nd almost vertical, the 3rd strongly bent 

 Fig. 175. — Tetralonia inwards, making the 3rd cubital cell at top 

 duvaucelii, c?. f. about half the length it is below, the 2nd 

 recurrent nervure received very nearly at the 

 apex of the 3rd cubital cell ; legs slight, the posterior tibiae not 

 so densely pubescent as in the genus Antliophora. Abdomen short, 

 broad, depressed, subcordate. 



Nothing is known of the habits of the two Indian specie.^ of 

 this genus. 



Key to the Species. 



a. Clypeus yellow T. duvaucelii, p. 620. 



b. Clypeus black , T. himalayensis, p. 521. 



917. Tetralonia duvaucelii, Lepel Hym. ii, p. 98, s • 



Tetralonia elegans, Smith, Cat. ii, p. 302, ^ ; Dall. Torr. Cat. x, 

 p. 232. 



(S . Head, thorax, and abdomen densely pubescent ; the clypeus 

 nearly square, very slighiiy emarginate anteriorly, and very liglitly 

 punctured ; thorax above under the pubescence closely and 

 more strongly punctured ; abdomen with the apical margins of 

 segments 1-5 non-pubescent and very finely aciculate. Black; 

 the face below the base of the antennae, the clypeus, labrum, and 

 mandibles at base yellow, the latter at apex and the 3rd and 

 following joints of the flagellum of the antennae testaceous red ; 

 the face above the bases of the anteuncc, the cheeks and occiput, 

 the thorax, and base of the abdomen with pale fulvous-yellow 

 pubescence, that on the legs silvery; base of abdominal segments 

 2-4 with transverse fasciae of white, the 5th segment entirely- 

 covered with white, and the 6th and apical segments with fuscous 

 pubescence ; wings hyaline, faintly clouded at their apical mai^gins. 



Var. The pubescence more or less fulvous. 



Hah. India (Smith) ; Kumaun (Miss A. Brook) ; Bombay, 

 c? . Length 10-11 ; exj>. 18 mm. 5 unknown. 



