444 P. CAMERON. 



Wings not pale at the base, uniformly dark fuscous. 



Head, scutellum and metanotum black Weyenbergi. 



Head, scutellum and middle of metanotum red Lyncliii. 



Wings pale at the base. 



Occiput and outer orbits red, mesonotum with three black marks. 



Holmbergii. 



Occiput and outer orbits black, mesonotum not maculate with 



black. 



Apical half of scutellum red, apex of occiput with a transverse 



red mark, lower part of mesopleurse with a longitudinal 



red streak adornatus. 



Scutellum and vertex enterly black, lower part of mesopleurse 

 not streaked with red Brethesii. 



28. Iphiaulax Lyncliii sp. n. 



Bright-red (the color of red sealing wax), the antennae, the face, 

 tips of mandibles, palpi, a mark covering the front, roundly narrowed 

 behind and enclosing the ocelli, the lower half of the occiput broadly 

 laterally, two marks close to each other on the apex of the mesopleurse, 

 the upper longish oval, the lower narrower and conical, the narrowed 

 end below, the breasts, the black on the prosternum extending on to 

 the pleurae, line, twice longer than wide, transverse at the base, its 

 apex rounded, on the lower apical half of the mesopleurse, the meta- 

 pleurae and the legs, black ; the four anterior tibiae and all the tarsi 

 dark rufous. Wings dark fuscous, the stigma, except narrowly at the 

 base and apex, pale ochraceous yellow, the first cubital and the dis- 

 coidal cellules with the usual hyaline small clouds ; the third abcissa 

 of radius twice the length of the basal two united ; the recurrent nerv- 

 ure interstitial. Tegulae red, like the thorax. 9. Length 12 mm., 

 terebra 7 mm. 



Smooth and shining, including the abdominal furrows. Antennal 

 scape three times longer than wide, its apex projecting into a tooth 

 below. Face closely rugose, covered with black hairs ; the antennal 

 tubercles, the lower half of the clypeus and the oral region rufous. 

 Temples a little longer than the eyes, rounded behind. Abdomen as 

 long as the thorax, and wider than it; smooth, the area on second 

 segment becoming narrowed towards the apex, but not to a sharp 

 point, the apex being blunt and transverse. Suturiform articulation 

 wide, with a long oblique apical branch, which commences near the 

 middle of the segment ; there are smooth furrows on the apices of the 

 third and fourth. The penultimate ventral segment and the hypopy- 

 gium are black. 



Mendoza, March. 



^ 29. Iphiaulax Weyeubergii sp. n. 



Bright-red (the color of red sealing wax), the antennas, head, palpi, 

 mandibles, scutellum, metathorax, the breasts, lower edge of pro- 

 pleurae, a large mark on the apical half of the mesopleurse, the upper 



