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XXIII. Dcscnptio)isqf ten new species of Nematus from 

 Britain. By P. Cameron. 



[Read December 6tli, 1882.] 



The Group of N. mollis. 



A REVISION of my material in this distinct group of 

 Nematus has enabled me to identify seven British species. 

 I give below a table of those of which I have females, 

 and have added a description of a new species : — 



1 (2). Mesonotum smooth, shining, impunctate ; anterniffi 



shorter than abdomen, brownish beneath . . scoticus. 



2 (1). Mesonotum punctured, opaque or semiopaque; 



antennse black. 



3 (4). Frontal area distinct ; 3rd cubital cellule con- 



siderably dilated at the apex ; stigma fuscous . . moUi.^. 



4 (3). Frontal area indistinct ; 3rd cubital cellule scarcely 



dilated at the aj^ex ; stigma testaceous. 



5 (6). Antennae as long as the thorax and abdomen in J; 



as long as the body in (^ ; clypeus white .. breadalbanensis. 



6 (5). Antennas not longer than abdomen in ^ and J ; 



clypeus black. 



7 (8). Labrum white ; spurs half the length of meta- 



tarsus ; wings not much longer than body . . carinatns. 



8 (7). Labrum black ; spurs one-third of length of meta- 



tarsus ; wings longer than body . . . . lativentris. 



Nematus breadalbanensis, n. s. 



Black ; apex of clypeus, labrum, and palpi, white ; 

 legs pale testaceous ; the coxae, except at extreme apex, 

 the trochanters in part, the basal two-thirds of anterior 

 femora and posterior femora, almost wholly black ; with 

 the apex of the hinder tibiae and tarsi fuscous. Head 

 roughly punctured, opaque, slightly pilose, scarcely 

 broader than the mesothorax ; vertex thick, front pro- 

 jecting ; labrum subquadrate ; mandibles jjiceous ; thorax 

 black, scarcely shining, covered with a sparse pube- 

 scence, minutely j)unctured ; pleurae punctured, opaque, 

 and covered with a close short pile ; the edge of the 

 pronotum and tegulae are pale testaceous ; the cenchri 



TRANS. ENT. SOC. 1882. — PAJRT IV. (dEC.) 



