22 Cameron, Hymenoptera Orientalia. 



The head is larger than usual, and much more sharply 

 and distinctly margined behind ; the vertex is distinctly 

 furrowed, and the frontal area is distinctly defined. 



Tenthredo MEGACEPHALA, Sp. nov. 



Flavo-testacea ; flagello antennariim, femoribus, tibiis^ 

 tarsis posticis abdoininisque apice nigris ; alls fiavis, apice 

 fumatis. $ . 



Long. 17 mm. 



The scape of the antennae covered with a longish, the 

 flagellum densely with a short, black pubescence. Head 

 large ; the occiput sharply margined ; the vertex raised 

 in the middle, the furrows wide and deep, extending 

 below the ocelli ; the raised part of the vertex indistinctly 

 keeled down the middle. The front is raised in the 

 middle below the ocelli ; the apex of the raised part 

 depressed, narrowed gradually towards the apex, and with 

 a keel in the middle ; the keel broad at the base, gradually 

 narrowed towards the apex. Clypeus and labrum smooth, 

 pallid yellow ; the apex of the clypeus roundly incised ; 

 the apical half of the labrum and the basal half of the 

 mandibles covered with long, fulvous hair ; the apex 

 black. Mesonotum of a darker colour than the rest of 

 the thorax ; closely and rather strongly punctured, thickly 

 covered with short, black hair ; the middle lobe raised 

 and furrowed in the middle. Scutellum large, pyramidal, 

 the top with a longitudinal keel, and bearing long, black 

 hair. The cloud in the fore wings extends from the end 

 of the transverse radial, the second transverse cubital, and 

 the second recurrent nervures ; there is a distinct smoky 

 cloud in the apex of the hinder wings. The four anterior 

 legs are yellow, paler at the base ; the apices of the tarsi 

 infuscated ; the hinder legs black, except the coxa^ and 

 trochanters ; all the tibiae and tarsi are thickly covered 



