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



both ends ; the rest of the abdomen bUick ; the apex acute ; hypo- 

 pygium prominent. Valves of the terebra broad, conic, black. ^ 

 dissimilar; antenna3 composed of 13 joints, whereof the two apical 

 ones are discrete ; almost moniliform, brownish at the base ; stigma 

 hyaline, immaculate ; radial nervure more distinct ; abdomen much 

 narrower ; 1st segment narrow, linear, margined, suddenly con- 

 tracted at the extremity ; the testaceous colour of the two basal 

 segments more obscure ; posterior part of the abdomen narrow, 

 oblong, sublinear, rounded at the apex. $ Length, 5 ; exp. 1^ : 

 (^ length, f ; exp. H lines. 



I obtained the two sexes out of Aphis rumicis, L., a poly- 

 phagous puceron inhabiting Rumex cris2ms, the curled 

 dock, and many other plants ; found in the present case 

 on Faha vulgaris, the broad bean. 



37. Aphidius amhiguus, Haliday. 



A. amhiguus, Hal., lib. cit., 104 ; Marsh., lib. cit., p. 

 600, $. 



5 Abdomen subsessile, 1st segment short, cyathiform. Antennae 

 filiform, black, longer than the head and thorax, 13-jointed. Wings 

 hyaline ; stigma pale brown ; cubital areolets and exterior nervures 

 obsolete. Legs pale yellow, coxae and tarsal claws infuscated ; the 

 4 posterior legs have the middle of the femora and tibiae, and the 

 apex of the tarsi infuscated. Abdomen short, oval, lanceolate, pale 

 at the base, piceoiis posteriorly ; tubercles of the 1st segment 

 visible. Valves of the terebra acute. ^ Unknown. Length, ^ ; 

 exp. \^ lines. Haliday. 



Found rarely in marshy places. 



38. Aphidius dauci, Marshall. 



A.dauciy Marsh,, lib. cit., p. 601, $ ^ . 



$ Head and thorax black, abdomen brown, with the 1st 

 segment testaceous. Clypeus black ; mouth and palpi either dull 

 testaceous or brownish. Antennaj 13-jointed, scarcely longer 

 than the head and thorax, 1st and 2nd joints brown, base of the 

 3rd pale. Mesonotum witbout furrows, l)ut these are sometimes 

 indicated by two slight longitudinal depressions ; metathorax car- 

 iuated, areated. Wings hyaline ; squamula; and radicles pale ; 

 stigma hyaline, hardly tinged with yellow ; basal nervures tolerably 

 distinct, brownish testaceous ; 2nd cubital areolet effaced, or only 



