50 NEMATUS ERICHSONI. 



78 (79) Yellow, apex and base of abdomen not black. 



Croceus, cadderensis, glottianus. 



79 (80) R/eddish, apex and base of abdomen black. 



Rufescens, glenelgensis. 



80 (84) Stigma black or fuscous. 



81 (82) Antennae entirely black. CoUinus. 



82 (81) Antennas fuscous beneath. Eibesii. 



83 (75) Meso- and metanotum entirely yellow. 



84 (85) Stigma black at the base, ovipositor long. Luteus, acuminatus. 



85 (84) Stigma yellow, ovipositor short. Croceus, flavescens, dorsatus. 



I. THE GROUP OF ERICHSONI. 



Black, with abdomen banded with red, or fulvous with 

 black above. Legs variegated ; the femora reddish or 

 fulvus, black at the apex ; posterior tibice pale for the 

 greater part, grooved. Antennce with the third and 

 fourth joints about equal. Clypeus truncated, front wide, 

 antennal fovea large, but not very deep. Wings with 

 first transverse cubital nervure absent, the third cubital 

 cellule longer than broad. Stigma blackish. Claws 

 with a minute subapical tooth. 



A group of small extent, principally distinguished 

 from the next by the red-banded abdomen. The larvas 

 of the two species are utterly dissimilar. 



1 (2) Breast opaque ; antennas brown underneath, short. Erichsoni. 



2 (1) Breast smooth, shining ; antennas quite black, long. Quercifs. 



1. NEMATTTS ERICHSONI. 

 Plate XY, fig. 1, Saw. 



Nematus Erichsoni, Hart., Blattw., 187, 9 ; Saxesen, Isis, 1838, 

 803; Tischbein, AHgem. Forst. u. 

 Jagd., 1840, 37 ; Ratz., Forst-Ins., 

 121, pi. 3,f. 4 (egg, lar ,im.); Thorns., 

 Opus., 620, 14 ; Hym. Scand., i, 96, 

 19; Kalt., Pfl., 700; Br. and Zad., 

 Schrif. Ges. Konig., xvi, 60, pi. 4, 

 f. 8 (lar.) ; Andre, Species, 102, 10, 

 pi. xiii, f. 15 -, Cat., 13,* 6. 



