74 GENUS ANDEICUS. 



2. DlASTEOPHUS APHIDIVOEUS. 



PI. XIII, fig. 7, ? . 



Diastrophus (?) aphidivorus, Cameron, Proc. Lit. and Phil. 



Soc. Trans., Manr., ii (4), 67. 



Black ; the antennae testaceous ; the legs rufo-testaceous ; the tips of 

 the tarsi black; wings almost hyaline, the nervures fuscous, thick. 

 Antenna? stout, a little longer than the body ; the third joint sinuate, 

 a little longer than the fourth. Head large, a little wider than the 

 thorax, shining, impunctate. Prothorax large, finely rugose, semi- 

 perpendicular in the middle. Mesonotum shining, obscurely striated 

 at the base ; the parapsidal furrows distinct at the base. Scutellum 

 rugosely punctured, depressed in the centre ; the basal fovea? large, 

 wider than long, curved, united. Metapleura? rugosely punctured. 

 Abdomen shining ; the second and third segments subequal, apical 

 ventral segment bluntly ploughshare- shaped, not projecting beyond 

 the apex. Hind tibia? curved ; the metatarsus twice the length of the 

 second joint ; claws apparently simple ; wings ample ; the radial cellule 

 open at base and apex and in front ; narrow, elongate ; the third 

 abscissa of the radius curved ; cubitus nearly complete. (?. 



Length nearly If mm. 



Differs from Diastrophus proper in the claws being 

 simple, in the scutellar foveas being confluent, and 

 there is a depression in the centre of the scutellum. 



Bred by Rev. T. A. Marshall at Barnstaple from the 

 Aphis of the nettle. 



Genus Andeious. 



Andricus, Hartig, Germs. Zeits., ii, 185. 



Callirhytis, Foerster, Verh. z.-b. Ges. Wien, 1869, 335. 



Aphilothrix, Foerster, 1. c, 336. 



Antenna?, $ 12 — 15-jointed, $ 14— 16 -jointed, the third joint longer 

 than the fourth ; without hairs. Cheeks rarely with a furrow, either 

 as long as or shorter than half the length of the eyes. Head with the 

 agamic forms always dilated behind the eyes, with the female sexual 

 forms often, with the $ seldom dilated. Parapsidal furrows complete, 

 sharp. Scutellar foveas sharply separated. The median segment with 

 the keels straight and parallel, or curved as in A. ostreus. Abdomen 

 compressed, the segments distinctly separated, the ventral horn pro- 

 jecting, moderately long. "Wings with the radial cellule open, elongate, 

 the areolet generally present. The claws bifid, except in Callirhytis, 

 which has them simple; Callirhytis being further distinguished by 

 having the mesonotum transversely rugulose. 



