446 P. CAMERON. 



apex of scutellum, the space between it and the wings, the post-scutel- 

 lum, metathorax, except for a streak in the middle of metanotum, the 

 breasts, the lower part of the propleurae, a large mark on the apical 

 three-fourths of the mesopleurae in the middle, the mark below becom- 

 ing gradually obliquely widened, until it unites at the apex with the 

 black on the sternum ; its base above becomes obliquely sloped, form- 

 ing a triangle with the apex above ; the mark is then continued straight 

 to the base, which is bluntly rounded, the narrowed basal part form- 

 ing almost a square. The base of the propleurae is black to near the 

 top ; the red central part being triangular. Wings fuscous, the basal 

 cellules lighter colored, especially at the base ; the first cubital cellule 

 clearly hyaline except at the lower basal corner, the cloud in the dis- 

 coidal cellule quadrate, longer than usual ; the recurrent nervure is 

 received in the apex of the first cubital cellule, clearly distant from the 

 transverse cubital nervure. Area on base of second cubital cellule 

 two-thirds of the length of the segment, not narrowed to a point, its 

 apex half the length of the base. The suturiform articulation is finely 

 striated in the middle, the apical furrow distinct, but shallow, the outer 

 edge of the area not half the total length ; the area becomes gradually 

 narrowed from the outer to the inner side ; there are distinct furrows 

 on the apices of the fourth and fifth segments. cT 1 . Length 10 mm. 



The apical two ventral abdominal segments are black. The face is 

 covered with short, white, intermixed with longer black hair ; the 

 metathorax is densely covered with white hair. There is an obscure 

 red narrow line in the centre of the orbits. 



Mendoza, March. 



Comes near to /. Holmbergi, having like it the base of the 

 wings pale and the mesopleurae with a red wedge projecting 

 into the black ; Holmbergi may be known by the mesonotum 

 having three black marks, its scutellum is entirely red, all 

 the tarsi are testaceous, the outer orbits and the outer edge 

 of the vertex are not black as in the present species, and the 

 area on the second abdominal segment is narrower and more 

 sharply pointed ; the outer raised area on the base of the 

 third segment is narrower on the outer side and it reaches 

 nearer to the middle ; it is also, owing to its being narrower, 

 not so near to the middle of the segment. 



-J 32. Iphiaulax Brethesii sp. n. 



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

 dibles, palpi, scutellum, metathorax, prosternum, lower edge of pro- 

 pleurae, mesosternum, mesopleurae from the oblique basal furrow, leav- 

 ing a red triangular upper basal part, the apical segment of the ab- 

 domen and the legs, black ; wings fuscous, the base of the anterior 

 hyaline to near the transverse basal nervure, the greater part of the 



