28 Mr. P. Cameron on new Aculeate Ilymenoptera 



silvery pubescence. Thorax alutaceous; tlie apex of the 

 proiiotum thickly covered with silvery pubescence; the nieso- 

 notuu) with a pale down. Scutelluni minutely punctured. 

 Median segment alutaceous, the sides transversely striated ; 

 the apex is closely transversely striated, the sides tiiickly 

 covered with silvery pubescence ; the furrow is longer than 

 usual. Pro- and mesopleura; alutaceous; the metapleurse 

 closely, finely, obliquely striated, the apex thickly covered 

 with silvery pubescence. The metasternal keel is hollowed 

 throughout; the central keel is ill-defined. Legs pruinose ; 

 the spines are black. Wings short, hyaline, the basal half 

 yellowish ; the iirst cubital cellule at the top is two-thirds of 

 the length of the second; the first transverse cubital nervure 

 is oblique at the top, the middle curve rounded ; the second 

 recurrent nervure is received distinctly behind the middle 

 and is somewhat sharj)ly elbowed. The abdomen is as long- 

 as the head and thorax united ; the pygidium smooth, 

 shining; the lateral keels distinct. 



C^XOLARRA, gen. nov. 



Second cubital cellule shortly stalked. Radial cellule 

 short, wide, the apical abscissa of the radius large, oblique. 

 Irmer eye-orbits with distinct folds. Eyes reaching to the 

 base of the mandibles. The hinder ocelli obliterate 1. Man- 

 dibles incised on the lower side. The hinder edge of the 

 pronotum not placed below the hinder edge of the nieso- 

 notum. Median segment as long as the mesotiiorax ; its 

 apex with an oblique slope. Tibia3 and tarsi sparsely spined ; 

 the tarsi long; the claws short, simple; the front tarsi not 

 with long spines as in Tachysj^hex^ &c. 



The eyes converge a little above ; the second joint of tlie 

 antennae is pilose ; the top of the pronotum has oblique sides; 

 the pygidium is pilose; the hinder tibite grooved; the 

 ptevostigma is small. The structure of the prosternum is 

 rather peculiar ; it is large, keeled down the middle; the sides 

 project at the a])ex, the middle of the projection is depressed, 

 so that there is thus formed two blunt rounded teeth. 



This genus comes nearest to Noiogonia, with which it agrees 

 in the structure of the thorax, head, and abdomen ; but may 

 be readily separated from it by the transverse cubital nervures 

 being united at the top and there shortly appendiculated. 

 The only genus of Larridm with an appendiculated cubital 

 cellule with which it could be confounded is Palarus, but 

 that is readily separated by the ocelli being complete. 



The radial cellule is wide and hardly reaches to the apex of 



