32 Rev. T. A. Marshall's 3[onof/raph of 



infuscated. Head and thorax black ; oral parts yellow. Antenncc 

 11-jointed, slender, longer in proportion to the body than in the rest 

 of the species, fuscous with the 4 basal joints yellow. Wing hya- 

 line ; stigma pale yellow ; nervures brownish ; radicles and squamulaj 

 dull stramineous. Legs either wholly pale, or with the middle of 

 the hind femora and tibitie slightly infuscated. Abdomen slender. 

 ^ Unknown. Length, I ; exp. 1 h lines. 



Taken rarely by Haliday on sedge, Carcx, and once on 

 a nut-bush, Cory Iks avellana. 



10. Trioxys Idifcr, Haliday. 



Aphidins (T.) Ictifer, Hal, lib. ciL, 491, $ . 

 T. Ictifer, Hal., lib. cit., p. 5G7, $ . 



9 Abdomen anteriorly dull yellowish ; 1st segment infuscated in 

 the middle. Antenna? 11-jointed, rather short, with the scape 

 brown, and the base of the flagelluni pale. Similar to heraclec (sp, 

 3). Head and thorax black. Legs ol>scure ; tarsi short. ^ Un- 

 kno\vn. Length almost -| ; exp. 1 line. 



Reared by Haliday from the pucerons of a species of 

 willow, Salii: ulmifoUa, in June. 



VL APHIDIUS, Nees. 

 Nees, Act. Ac. L.C., ISIS, p. 302. 



Head as wide as the thorax, rarely wider or narrower ; face short ; 

 mandibles feebly bidenticulate ; palpi with a variable number of 

 joints, 4, 3, or 2, in the maxillary, 3, 2, or 1, in the labial. Antenntc 

 11-27-jointed ; the number is important for specific discrimination, it 

 is nearly constant in each species, admitting only 1 or 2 joints in excess 

 or defect ; it is more variable in the species which have 20 joints and 

 upwards ; only one species is known with 27 joints, which does not 

 occur in England. Mesothoracic furrows i;sually effaced, rarely 

 more or less visible ; metathorax very short, abruptly inclined, often 

 canaliculate in the middle and regularly areated by raised lines. 

 First cubital areolet always confounded with the praediscoidal, some- 

 times open also beneath, owing to the effacement of the cubital 

 nervure, in which case it ceases to exist ; sometimes limited on the 

 underside by the same nervure ; intercubital nervures none, or very 

 indistinct ; the discoidal areolets are also liable to disappear, the 2nd 

 (when it exists) is closed posteriorly ; anal nervure interstitial ; 

 prsebrachial and pobrachial nervures approximated ; no prrebrachial 



