260 Mr. Shuckard's Monograph, of the Dorylldae, 



Abdomen with the base of the segments slightly constricted, its sides, at the 

 junction of the dorsal and ventral plates, inclining to a bright testa- 

 ceous; the peduncle nearly semicircular; the posterior angles straight, 

 plane above, with a transverse convex ridge at its apex j the ventral 

 portion viewed laterally produced acutely in the middle j the extreme 

 apex of the terminal segment vertically compressed, and the sexual 

 organ protruding in the form of an emarginate plate, the lateral por- 

 tions of which form two acute and compressed spines. 



In Mr. Westwood's collection. 



This species is from South America, where it was captured by 

 Mens. D'Orbigny, whose name Mr. Westwood suggested should be 

 applied to it, which I accordingly adopt. It is the only black spe- 

 cies I know, and the peculiarities of its small ocelli and broad mar- 

 ginal cell also conspicuously distinguish it. 



Sp. 8. Lab. Klugii, Shuck. Length 4J lines. 



Expansion of the wings 8| lines. 



Rtifo-castaneus, pubescens ; vertice, thoracis dorso et stigmate alarum badiis: 

 clypeo tuberculis binis acutis instructis et pedunculo transversa qua- 

 drato siibconvexo. 



Reddish castaneous with the vertex, dorsal portion of the thorax and 

 scutellum, as also the stigma of the wing and the extreme base of the 

 intermediate segments of the abdomen, dark castaneous. Head having 

 the antennae very long and slender, the scape scarcely one-seventh the 

 length of the organ ; the ocelli placed in a curve upon the vertex, 

 the posterior pair situated close to the margin of the eyes : the facial 

 carinas less prominent than usual, and terminating by the side of the 

 anterior ocellus ; the clypeus armed with two acute and prominent 

 tubercles, the space between which and the mandibles narrow ; the 

 latter moderate and very slender. 



Thorax very gibbous in front, and at the scutellum, the latter fringed late- 

 rally: metathorax slightly convex : superior wings with their marginal 

 cell regularly lanceolate and rather larger than either of the two first 

 submarginals ; the radial nervure rounded and not angulated ; the first 

 submarginal rather larger than the second, the transverso-cubital ner- 

 vure that separates them being straight ; the recurrent nervure re- 

 ceived at about one half the length of the second submarginal cell, 

 and the cubital nervure beyond its insertion not thickened : l^s very 

 short and slender. 



Abdomen with the base of the intermediate segments slightly constricted : 

 the peduncle rather narrower than the following segment, transverse 

 quadrate, the posterior angles slightly rounded, plane above, with a 

 slight convexity in the centre of its apex j the apex of the terminal 

 segment less vertical than usual, but much compressed and fissile; 

 the sexual organ protruding in the form of a deeply emarginate plate. 



