NEMATUS HEKBACEjE. 205 



104. NEMATUS HERBAGES. 



PI. Ill, fig. 8, ? ; PL IX, figs. 3 3a, Lar. ; 36, Gall; 

 PI. XXVI, fig. 7, Saw. 



Nematus herlacece, Cam., P. N. H. S. Glas., ii, 304307 ; Fauna, 

 44, 59 ; Andre, Species, i, 160; Cat., 17,* 68. 



Antennae shorter than the body, moderately stout, covered with 

 close microscopic down., the two basal joints prominent, third and fourth 

 almost equal. Head black, shining, vertex faintly punctured, frontal 

 sutures distinct, antennal fovea deep, one-half longer than broad ; 

 covered with short pile ; mouth obscure testaceous, covered with longer 

 pilosity than the rest of the head ; the tips of mandibles blackish ; 

 thorax black, shining, the mesonotum obscurely punctured, and covered 

 with short pile ; breast smooth and shining, tegulce white. Abdomen 

 black, the apex angustate, pilose, anus pale testaceous ; saw longer than 

 half the abdomen, its sheath largely projecting and pilose. Legs stout, 

 femora for the greater part black, their apical third, knees, tibiae, and 

 tarsi, sordid testaceous ; the coxae and trochanters paler than the 

 femora ; tips of tarsi fuscous, posterior tarsi equal in length to tibiae. 

 Wings clear hyaline, costa and stigma sordid white, nervures black ; 

 the second recurrent nervure is received a short distance in front of the 

 second cubital. 



The $ has the antennae thicker and longer than in the other sex, the 

 tegulae black, and the stigma slightly darker ; the anus pale. 



Length 1| If lines. 



Similar to N. crassispina, but it has the antennal 

 fovea much more distinct, the incision in clypeus 

 deeper, the femora have less black on them, ovipositor 

 longer, spurs slightly shorter and thicker, and the 

 posterior tarsi are as long as, if not longer than, the 

 tibiae. It would seem to be very nearly allied to N. 

 dolichurus, Thorn., and may, indeed, be identical with 

 that species, but in dolichurus only the knees are 

 pallid and the abdomen apparently is entirely black. 

 The terebra and cerci are described by Thomson as 

 " longissimis," the former certainly is longer than in 

 any of the other species, but not the cerci, and no 

 mention is made by Thomson of the form of the cal- 

 caria in dolichurus, these being in herbacece shorter and 

 thicker than usual, a point which could scarcely have 

 escaped the eye of the distinguished Swede. 



This species forms galls on Salix herbacea. The 

 gall is roundish, sometimes oval or oblong, smooth, 



