20 Rev. T. A. :Marshairs Monofjraph of 



joint of the same length as the following ; legs more ol)Scure ; abdo- 

 men somewhat claviform, not longer than the head and thorax. 

 Length, 1| ; exp. ^\ lines. 



The commonest species of the genus : it seems to be 

 polypbagous, having been reared from the following 

 pucerons : C"lli2)teriis qtiercns, Kalt. on Qitcrcns robur, the 

 oak ; Siphono2)hora sonchi, L. on sow-thistle, Sonchus 

 oleraceus ; S. ahsintJiii, L. on Artemisia ahsinthium, worm- 

 wood ; S. cliclidonii, Kalt. on the greater celandine, 

 Chdidoniiiiii majns ; Aphis jyrnni, Reaumur, infesting the 

 apple-tree, Pijrus mains; the plum-tree, Prunns domestica : 

 the apricot-tree F. armcnioea ; and the medlar, Mcspilus 

 germaiiica. To these may be added some undetermined 

 pucerons of the garden chrysanthemum, Chrysanthemum 

 sinense, and of the Reine-Marguerite or China-aster, Aster 

 chinensis. The pupal state lasts only 11 days; it is 

 passed in a pyramidal tent-like cocoon constructed on a 

 leaf, under the empty skin of the aphis, which either 

 remains in position, or is detached by the wind or other 

 accident. A $ bred from CaMipterus had the 1st 

 segment rufous, and the dividing nervure between the 1st 

 cubital and priediscoidal areolets almost extinct. The 

 liyperparasites observed from this species were AUotria, 

 Ullrichi, Giraud; Isocratvs vulgaris, Walker; and an 

 indeterminable or new species of Lamprotatus. 



II. EPHEDRUS, Haliday. 



Hal, Ent. Mag., i. 485 (1833). 



Head as in the last genns, except that the labial palpi are only 

 2-jointed. Antennae ll-jointed in both sexes, the 3rd joint longest 

 in the 9 , hardly if at all elongate in the $ . Thorax pubescent or 

 glabrous ; mesothoracic furrows indistinct, converging as usual. 

 Prsediscoidal areolet complete ; 3 cubital areolets, the 2nd longer 

 than broad, receiving the recurrent nervure near its base ; stigma 

 prolonged and attenuated at both ends ; radial areolet complete : 

 cubital nervure inchoate only ; anal nervure almost interstitial ; no 

 costal areolet in the hind wings. Abdomen subpetiolate or subsessile, 

 lanceolate, compressed at the extremity in the $ ; in the ^ shorter, 

 oboval or sublinear ; 1st segment -;more or less narrow, cylindric, 

 somewhat arched, its tubercles obsolete. 



Four European and two American species have been 

 described. They are very similar to the genus Aphidius, 



