44 GENUS NEMATCTS. 



Genus NE M ATUS . 



Nematus, Pz., F. G., Heffc xc, pi. x (1805) ; Jurine, Hym., 59. 

 Messa, Leach, Z. M., iii, 126. 



Antennae nine-jointed, the third joint equal to the fourth or shorter 

 than it, seldom longer than it. Wings with one radial and three or 

 four cubital cellules ; if four the second receives both recurrent ner- 

 vures, if three the first receives them. Lanceolate cellule petiolated. 

 Posterior wings with two middle cellules. 



The antenna? are usually shorter than the body, and 

 may be filiform or setaceous and sometimes com- 

 pressed, with the joints produced at the apices. The 

 pentagonal area and the sutures on the vertex are 

 usually distinct enough. The clypeus may be deeply 

 incised, slightly curved, or completely transverse. 

 The eyes do not reach to the base of the mandibles ; 

 these are of moderate size, broad at base, blunt at the 

 apex, and have no distinct subapical tooth. The palpi 

 are longish, thicker at base than at apex, and with the 

 joints of varying length. 



The abdomen is short and broad, or long and cylin- 

 drical. The last segment may be scarcely developed 

 above or may be developed largely ; beneath it may be 

 very short or may occupy the greater part of the ventral 

 surface ; in the latter case the cerci are long. The 

 blotch is seldom very large. 



The legs are of moderate length ; the calcaria are 

 not much more than one-third of the length of the 

 metatarsus and may be shorter; the claws simple, 

 bifid, or with a subapical tooth. 



The third cubital cellule is much longer than the 

 second ; the transverse median nervure is received near 

 the middle of the cellule and does not vary much in 

 position. In some species the second recurrent ner- 

 vure is interstitial ; the transverse median nervure in 

 the hind wings may be joined to the recurrent or 

 placed at a greater or less distance from it. The 

 accessory nervure is appendiculated more or less 



