AMERICAN HYMENOPTERA. 431 



the upper two-thirds, its base rounded and its apex extending on to 

 the outer side, the base and apex of the hind tibiae, the black central part 

 narrower on the outer side than the yellow basal and apical parts, and 

 extending broadly on to the upper side, bright lemon-yellow ; the hind 

 tarsi yellow, tinged with rufous. Wings clear hyaline, the nervures 

 black, 9 . Length 5 mm. 



The face, sides of front, outer orbits, apex of scutellum, the meso- 

 pleurae, the second to sixth abdominal segments densely covered with 

 silvery pubescence. Vertex, sides of front and inner part of malar 

 space closely punctured ; the latter broadly rounded below, margined 

 at the edge and depressed above it. Sides of face aciculated, the mid- 

 dle smooth and shining, the clypeus bordered above by a rounded 

 broad keel, below which it is flat. Propleurae smooth, an oblique keel 

 in the middle, below which is a thinner, almost straight one, and 

 under the latter is a stouter obliquely curved one. Mesopleurse smooth, 

 broadly depressed beyond the base ; the latter has the upper half 

 smooth and bearing margined foveas, the lower half is opaque and 

 bearing longitudinal keels, the space between which is depressed ; the 

 upper basal part of the central portion bears seven or eight stout, clearly 

 separated keels, the top and bottom of which are longer than the others. 

 Metanotum regularly reticulated, the central basal area twice longer 

 than wide, obliquely narrowed towards the apex. Basal two segments 

 of abdomen smooth, bare, the third smooth in the centre, the rest, as 

 are also the sides of the other segments, somewhat strongly punctured ; 

 the fourth and following segments aciculated in fhe middle. 



Mendoza, February. 



PERILAMPID^E. 

 PERILAMPUS Latr. 

 15. Perilampus igniceps n. sp. 



Blue, the head firey red, the front in the middle at the eyes blue, the 

 pro- and mesonotum dark blue, the scutellum blue, tinged with green, 

 the pro- and mesopleura blue with brassy tints, a distinct brassy line 

 down the base of the mesopleuras, the apex of the mesopleurae, the 

 metapleurae and the breast dark blue. Legs dark blue, the hind tibiae 

 black, the tarsi more or less testaceous. Antennal scape blue, firey 

 red in the middle, the flagellum rufo-testaceous. Wings hyaline, the 

 nervures black. 9- Length 3 mm. 



Head smooth and shining, bare. Clypeus large, semi-circular, dis- 

 tinctly separated all round. The lower half of the face in the centre 

 forms an oval raised piece. Pro- and mesonotum with the scutellum 

 closely, somewhat strongly rugosely punctured, the punctures running 

 into reticulations especially on the scutellum ; the sides of the middle 

 lobe of mesonotum at the apex, broadly smooth. Propleurae punctured 



TRANS. AM. KNT. SOC, XXXV. DECEMBER, 1909. 



