150 NEMATUS FLAVESCEtfS. 



Nematustestaceus, Thorns., Hym. Sc., i, 153, 86; Andre, Spe- 



cies, i, 222 ; Cat., 25,* 194. 



varius, Br. and Zad., Schr. Ges. Konig., xvi, pi. v, f. 3 ; 

 1. c., 296. 



Pale yellow, face below the antennae, the part surrounding the eyes, 

 coxae, trochanters, and edge of pronotum with the tegulae, paler. An- 

 tennae a little shorter than thorax and abdomen, the third joint shorter 

 than fourth, the basal joints marked with black at their junction. 

 Vertex finely punctured, pentagonal area not very distinct ; antennal 

 fovea longish, heart shaped, moderately deep ; clypeus notched ; the 

 tips of mandibles piceous ; palpi pale testaceous. Mesonotum reddish- 

 testaceous, punctured ; pronotum with tegulae pale testaceous, the 

 pleurse smooth, shining, paler than the mesonotum ; cenchri small, pale 

 white. Wings clear hyaline, with a faint yellowish tinge, nervures at 

 base blackish, at the apex with the costa and stigma pale testaceous ; 

 the second cubital cellule is double the length of the third ; the second 

 recurrent nervure received about three-fourths of the length of the 

 third cubital cellule ii] front of the second transverse cubital. Posterior 

 tarsi a very little shorter than the tibiae ; spurs reaching near to the 

 middle of the metatarsus. Abdomen a very little longer than the head 

 and thorax, slightly dilated in the middle, narrowed to a point from the 

 fifth segment ; cerci shorter than spurs, pale testaceous ; saw projecting 

 considerably, the sheath black at the extreme apex. 

 Length 2^3^ lines. 



Very like the pale ab. of N. croceus, but is smaller, 

 the colour more diluted, the antennae shorter, cerci 

 shorter, sheath black only at extreme apex, and ner- 

 vures much paler throughout. 



The larva has the head roundish, translucent whitish- 

 grey, and covered with longish white hairs ; eye-spots 

 and tips of mandibles black, mouth brown. The upper 

 part of the body white, assuming a greenish hue when 

 the food canal-is filled, the lower part paler than the 

 upper ; the skin is covered with tubercles, each ending 

 in a hair. Legs white, with a line of black dots over 

 them ; claws faintly brownish. The body is flat 

 rather than cylindrical. 



It feeds on the under side of the leaves of Salicc 

 caprea with the colour of which it harmonises very 

 closely. It is found from August to the end of 

 September. The cocoon is spun in the earth, the fly 

 appearing in the following June. The late Prof. 

 Zaddach compared my specimens with Hartig's type 

 of N. pallescens, and the only appreciable difference 

 between the two that he could find, was that the latter 



