NEMATTTS XANTHOGASTER. 177 



rower and more slender, it has less black colour, the 

 second recurrent nervure is not interstitial and the 

 claws are bifid. 



I have noticed the following aberrations : 



a. Mesonotum with the sutures marked with luteous. 



b. Pleurae immaculate. 



c. Base of abdomen black. 



d. Tips of posterior tibise and tarsi immaculate. 



e. Costa and stigma luteous. 



A common South of England species. 



Continental distribution: Sweden, Germany, France. 



86. NEMATUS XANTHOGASTER. 



PI. IX, fig. 8, Larva; 8 a, Head; 8 &, Leaf eaten by 



Larva. 



Nematus xanthogaster, Foer., Verb. pr. Rheinl., 1854, 315; 



Kalt., Pfl., 580 (lar.); Cam., 

 P.N.H.S.Glas., ii, 313; I.e., 

 iii, 202; Br. and Zad., Schr. 

 Ges. Konig., xvi, pi. 6, f. 7 ; 

 1. c., xxiv, 321 ; Andre, Species, 

 i,224; Cat., 16,* 59. 

 piliserra, Thorns., Hym. Sc., i, 89, 10. 



Reddish-yellow, a large mark on the vertex extending from the end 

 of the frontal area to the back, where it is narrowed, mesonotum, 

 metanotum, and base of abdomen in the middle above (usually the two 

 basal segments), black. Antennae black or fuscous black above, the 

 apex and lower surface reddish. In the <^ they are longer and pilose, 

 the third joint is shorter than fourth, and is curved. Apices of pos- 

 terior tar sal joints distinctly, and anterior slightly, black. Wings 

 hyaline, stigma livid testaceous *, costa fuscous. On the breast there 

 is always on the $ a broad black mark, or more often two ; it is also 

 present occasionally in the ? . Mesonotum and especially scutellum 

 strongly punctured ; claws bifid ; the spurs do not reach to the middle 

 of metatarsus. 



Length 2f 3 lines. 



In coloration this species resembles closely N. bipar- 

 titus, but the black on the vertex is much less extended, 

 the mesonotum and scutellum much more strongly 

 punctured ; the wings of a clearer hyaline ; costa 

 much darker coloured than the stigma, and the tarsi 



VOL. II. 12 



