NEMATUS RUMIOIS. 179 



Synopsis of Species. 



1 (2) Wings yellow. Rumicis. 



2 (1) "Wings hyaline. 



3 (4) Mesonotum and scutellum punctured, the latter gibbous ; stigma 



pale yellow, the extreme apex fuscous. Scotaspis. 



4 (3) Scutellum impunctate, stigma not fuscous at apex. 



5 (6) Antennas long, thin ; head reddish-yellow, except in centre of 



vertex. Arcticus. 



6 (5) Antennae short, moderately thick, head black, the eyes sur- 



rounded with luteous. Togatus, vesicator. 



87. NEMATUS EUMIOIS. 

 PI. I, fig. 7, <$ ; fig. 8, ? ; PL XXV, fig. 5, Saw. 



Tenthredo rumicis, Fall., Acta, 1808, 123, 63 ; Zett., Ins. Lapp., 



354, 56. 

 Nematus xanthopterus, Dbm., Consp., 8, 59. 



caprece, Htg., Blattw., 198, 26. 



rumicis, Thorns., Opus., 627, 28 ; Hym. Scand., i, 119, 



45; Br. and Zad., Schr. Ges. 

 Konig., xvi, pi. 5, f. 11; Andre, 

 Species, i, 156; Cat., 21,* 149; 

 Br. and Zad., Schr. Ges. Konig., 

 xxiv, 299, 45. 



fiampennis, Cam., E. M. M., xii, 189. 



Antennas longer than the thorax and abdomen, black, bare, almost 

 shining, the third and fourth joints nearly equal; the remaining a little 

 shorter and tapering towards the apex. Head punctured on the vertex, 

 the frontal sutures very distinct, the front strongly projecting ; black, 

 the face (including the part between the antennae) and the eyes (espe- 

 cially behind) broadly surrounded with reddish -yellow; the mandibles 

 deep brown, the clypeus with the apex notched. Thorax black, shining, 

 punctured above, the pronotum edged with obscure yellow-red ; cenchri 

 large, white. Legs reddish-yellow, the coxae partly, and femora broadly 

 at base, more or less marked with black ; the last three joints of the 

 posterior tarsi fuscous. Wings ample, strongly iridescent, yellowish ; 

 nervures, costa, and stigma reddish-yellow ; the second cubital cellule 

 nearly double the length of the third, which is scarcely dilated at the 

 apex ; second recurrent nervure received a little in front of the second 

 transverse cubital. Abdomen broad, dilated towards the middle, the 

 apex bluntly pointed ; black, smooth, shining, the anal segment and 

 belly in the middle reddish-yellow. The cerci are moderately long, pale 

 yellow, their apices pointing inwardly, saw projecting. 



The <$ is reddish, with the exception of the space surrounding the 

 ocelli, the metanotum, and the greater part of the back of the abdomen 

 which are black ; occasionally there are one or two small black marks 

 on the mesothorax, and the scape of the antennas is usually black. 



Length If 2| lines. 



