138 NEMATUS BETUL2E. 



62. NEMATUS BETUL^E. 

 PL XXII, fig. 7, Saw. 



Tenthredo betulce, Retz., De Geer, 308 ; De Geer, Mein., ii, 261, 



Taf. 37, f. 23. 



luridiventris, Zett., I. L., 352, 51. 

 Nematus letularius, Htg., Blattw., 192, 17 ; Toll., Tijd.Ent. (2), 



ii, 4, t. 6, f. 16 ; Kalt., Pfl, 607. 



testaceus, Jur., Hym., 64, pi. 13. 



erythrogaster, Thorns., Hym. Sc., i, 103, nee Norton. 



crassiventris, Cam., E. M. M., xiv, 267. 



luteogaster, Kir by, List of Hym., i, 132. 



betulce, Htg., Blattw., 219; Andre, Species, i, 219; 



Cat., 27 ;* Br. and Zad., Schr. Ges. 

 Konig., 307, PI. 6, f. 16 (1875). 



Black, sliming, covered with fuscous pubescence ; labrum, clypeus, 

 and the space between the antenna) dull white ; pronotum, tegulae, meta- 

 pleu'ra, side of metanotum and abdomen orange-yellow; legs pale 

 luteous, apex of posterior tibiae and tarsi fuscous, the base of meta- 

 tarsus pale ; spurs pale, reaching to middle of metatarsus. Antennae 

 as long as the abdomen and half of thorax, black, brownish beneath 

 from second joint, the third joint a little longer than fourth. Wings 

 hyaline, costa pale at base, the rest and stigma black ; third cubital 

 cellule as broad as long ; the transverse median nervure is received in 

 the basal side of middle of cellule. The frontal sutures are flat; penta- 

 gonal area indistinct, the antennal fovea wide and deep. Clypeus 

 roundly truncated. Cenchri large, clear white, the white membrane 

 between them large, immediately behind which is a short transverse 

 black line. Claws with a minute subapical tooth. 



The has the metanotum entirely black, and the dorsum of abdomen 

 marked with black transverse lines, which become continuous at base 

 and apex. 



Length 2| lines. 



Easily known from the other species in the group 

 by the totally black mesothorax, claws with a subapical 

 tooth, and the metanotum luteous at the sides 



The larva feeds on birch. Its head is entirely 

 black, the abdomen yellowish-green, shining, legs pale 

 green with black claws. Over the second and third 

 leg is a large triangular orange spot, at the same level 

 on the fourth segment are two smaller spots, more 

 oblong in form; and similarly coloured spots, but larger 

 and nearly triangular, are on segments five to eleven. 

 The stigmata have narrow white margins. It feeds 

 on the edge of the leaf, and pupates in a simple cocoon 

 in the earth. According to Brischke (1. c.) the eggs are 



