species of Nematus from Britaiii. 539 



The males of the two species are not readily separated, 

 but maculiger has the antennae more rufescent, the 3rd 

 joint longer compared to the 4th, the mark on vertex is 

 larger, the front is not so sharply pointed between the 

 antennae (this refers also to the female). In both sexes 

 the amount of black on posterior tibiae and tarsi and on 

 the back of abdomen varies. 



The larva has been found by Mr. J. E. Fletcher ; it is 

 very like that of lacteus, and is of similar habits. For 

 figure of the larva of the latter, see Monogr. Phyto.- 

 Hym., vol. i., pi. 6, fig. 8. 



Rare and local ; Clydesdale, Worcester. N. lacteus I 

 have not yet found in Scotland. 



Nematus ohlongus, n. s. 



Black ; labrum, tegulae, and the greater part of upper 

 lobe of pronotum, anal segment above and valves, dirty 

 white ; coxae, except at extreme base, trochanters, an- 

 terior tarsi and tibiae, pale yellow ; femora reddish 

 yellow ; apex of posterior tibiae and tarsi black. Antennae 

 thick, as long as abdomen and metathorax, tapering 

 somewhat towards the apex, the joints not clearly sepa- 

 rated at the base, more sharply separated at the apex. 

 Wings hyaline ; basal third of costa white, the rest of it 

 and stigma fuscous ; 1st transverse cubital nervure 

 pellucid ; 3rd cubital cellule a little longer than broad, 

 slightly dilated at the apex. Head thick, not dilated 

 behind the eyes ; vertical and frontal sutures obsolete, as 

 is also the pentagonal area ; clypeus truncated at apex ; 

 head, mesonotum, and upper half of pleura finely punc- 

 tured. The spurs are not much more than one-third 

 of the length of the metatarsus. Length, scarcely 2J 

 lines. 



Closely allied to N. appendiculatus, but is smaller, 

 broader, the antennae are thicker and shorter, vertex 

 thicker, and with the sutures obsolete or nearly so. It 

 comes very near to aquilince, VolL, but that species would 

 appear to have the pronotum entirely black, as well as 

 the apex of abdomen, and the 1st transverse cubital ner- 

 vure is quite absent. 



England. 



