8 GENUS DINEUEA. 



on birch. The pupa is pale green ; the cocoon is as in 

 H. alni. 



Somewhat rarer than alni, but of equally wide range 

 in Britain. It is double brooded. 



Continental distribution: Sweden, Holland, Ger- 

 many, France, Hudson's Bay (North America). 



Genus DINEUEA. 



Dineura, Dbin., Comp., 5 (1835) ; Htg., Blattw., 226 (1837). 

 Mesoneura, Htg., 1. c., 228. 

 Nematus, pt. Thoms., Hym. Sc., i, 80. 

 Pristis, Brulle, Hym., iv, 665 (1846). 



Wings with two radial and four cubital cellules ; the second of the 

 latter is elongate, and receives both recurrent nervures, or the second 

 recurrent may be interstitial (Mesoneura). Lanceolate cellule petio- 

 late ; posterior wings with two middle cellules. 



Antenna 9-jointed, the third and fourth joints subequal, longish, and 

 filiform, or short and thick. 



The typical species have the antennae longer than 

 the abdomen, filiform ; the abdomen and the body 

 generally is elongate, the cerci longish. The mandibles 

 are longish, the apical tooth forming one-third of the 

 total length, and has a bluntly rounded tooth at its 

 base ; the basal three joints of the maxillary palpi are 

 thicker than the apical three, the second is nearly 

 double the length of the first, and scarcely half the 

 length of the third, which is longer than the fourth ; 

 the latter is a little shorter than the sixth ; the fifth is 

 the longest. The labial palpi do not vary much in 

 length. 



The second section has a thicker, shorter and stouter 

 body-form ; the antennge are short and thick ; and the 

 transverse radial, third transverse cubital, and second 

 recurrent are joined together = Mesoneura. 



The larvae of these two groups are sub-cylindrical, 

 flat on the ventral surface, and feed on the flat surface 

 of the leaf, eating usually only the epidermis. The 

 cocoon is single and is spun in the earth. 



The third group contains some small and little known 



