72 Rev. T. A. Marshall's Monograph of 



VII. DYSCRITUS, Marshall. 



Marsh., lib. cit., p. 617. 



Head semicircular above, hardly wider than the thorax, somewhat 

 flattened, much produced behind the eyes ; occiput not margined ; 

 clypeus not discrete from the face, clo.sing the mouth. Palpi short. 

 Antennre inserted in the upper part of the face, slender, filiform, as 

 long as the body ; 3i'd joint twice as long as the 4th. Mesothoracic 

 furrows complete ; a smooth foveola before the scutellum ; meso- 

 pleuraj smooth, their furrow obsolete ; metatliorax short, truncate 

 posteriorly, areated, the disc slightly inclined, separated from the 

 posterior declivity by a transverse carina ; 5 arese are distinguish- 

 able, 2 basal, separated by a carina, a postero-median complete, 

 pointed at the base, and one on each side of the vertical portion. 

 Wings ample, having the neuration of Praon, except that the 1st 

 cubital areolet is confounded with the 1st discoidal ; basal nervures 

 distinct, exterior nervures subobsolete ; no intercubital nervures, so 

 that there is but a single cubital areolet ; stigma rather large, tri- 

 angular, attenuated at both ends, emitting the radius from the 

 middle ; the latter gently curved without any angle, reaching the 

 tip of the wing, dark and distinct for one third of its length, after- 

 wards very fine and hardly visible to the extremity ; cubital 

 nervure very fine ; recurrent nervure very oblique ; anal nervure 

 not interstitial : 2nd discoidal areolet incompletely closed at both 

 ends. Abdomen sessile, as long as the head and thorax, strongly 

 compressed posteriorly from the base of the 3rd segment ; 1st seg- 

 ment rectangular, longer than broad, with well developed tubercles 

 placed in the middle ; viewed sideways, the abdomen is claviform 

 and flattened. Terebra very short, its valves stout. 



The insect which is here introduced differs from Praon 

 by the unusual form of the head, the confluence of the 

 1st cubital and 1st discoidal areolets, the complete area- 

 tion of the metatliorax, and the strong compression of the 

 abdomen. Although the habits of the single species, 

 and the corresponding male, are unknown, I have no 

 hesitation in joining it to the Aphidian group ; its external 

 forms indeed forbid any other allocation. 



DyscriUis planiceps, Marshall, /. c. 



9 Flavotestaceous ; stemmaticum, dorsum of the thorax and of 

 the abdomen in the middle, fuscous. Smooth, shining. Mandibles 



