8 Journal New York Entomological Society. [Voi.xvik 



the few which have been reared from willows which were specifically 

 determined. The galls of C. cooperce Ckll. and C. brachycai-pcp. Roh. 

 look alike, but occur on different species o{ Salix. 



Cryptocampus Hartig. 



Cryptocampns Hartig, Aderfl., p. 221 (1837). 

 Etmra Newman, Ent. Mag., Vol. 4, p. 259 (1837). 



Head small, seen from the front usually rectangular. Pentagonal area variable. 

 Antennse 9-jointed, slender, usually distinctly tapering; longer in the $ than in the 

 9 . Fore wings with three cubital cells, the second transverse cubitus wanting ; 

 stigma large ; lanceolate cell petiolate. Hind wings with two discal cells which are 

 normally equal on the outer margin ; lanceolate cell of hind wings with a long 

 petiole. Claws cleft, or with a large subapical tooth. Sheath variable. Cerci ( 9 ) 

 very long, slender. Procidentia ( $ ) variable but as a rule not very large. Hypo- 

 pygium ( J' ) large, extending beyond the procidentia. 



Table of the Adults. 

 ( C. albirictus and C. orbitalis v. niger have been omitted. ) 



Females i. 



Males 13. 



1. Almost entirely bright reddish-yellow (basal half of stigma pale ; ocellar basin 



well defined ) macgillivrayi Roh . 



Black, or at least the thorax almost entirely black 2. 



2. Clypeus entirely black 3. 



Clypeus with at least the apical margin pale 7. 



3. Legs below the coxae bright reddish-yellow (upper margin of the sheath taper- 

 ing ; middle fovea circular, small, rather indistinct) .perditiis Roh. 



Legs below the coxae and at least the femora at the base brownish 4. 



4. Ridges around the ocellar basin wanting (the basin is indicated by a shallow 



depression); tegulje sometimes pale 5- 



Ridges around the ocellar basin present, but rounded ; tegulae black 6. 



5. Lateral ocellar furrow deep, distinct ; antennae black ; sheath slightly emargi- 



nate above niger Prov. 



Lateral ocellar furrows almost wanting ; antennae more or less pale beneath ; 

 sheath straight above salicicola E. A. Sm. 



6. Sheath distinctly emarginate above ; labrum and mandibles entirely black. 



tnaurus Roh. 

 Sheath straight above ; labrum and mandibles testaceous insttlaris Kincaid. 



7. Walls of the ocellar basin well defined, although not always strongly so 8. 



Walls of the ocellar basin obsolete 12. 



8. Frontal crest unbroken (inner orbits broadly pale ; venation light brown ; legs 



entirely bright rufo-ferruginous) orbitalis Nort. 



Frontal crest distinctly broken 9. 



9. Abdomen above entirely black ; inner orbits black and usually the posterior ones ; 



frontal crest trilobate brachycarpa Roh. 



Abdomen at the apex above pale ; inner and outer orbits pale 10. 



