species of Tenthrediniclce and Cynipidce. 487 



double the length of 2ud ; 1st jomt of flagellum a little longer thau 

 the 2nd ; the joints taper a little in thickness towards the apex. 

 Cup of scutellum oval, shallow, the edge piceous ; fovese at its 

 base large, deep. Hair-fringe on abdomen griseous, of moderate 

 size ; the metanotum covered with longish white hair. The front 

 of the pronotum is produced in the middle into a plate, which 

 projects a little above the base of the mesonotum, is depressed in 

 the centre, and is broader at the bottom than at the top. The 

 sides are clearly margined and distinctly separated from the rest 

 of the pronotum. The latter is, at the sides close to the head, 

 covered with a dense tuft of griseous hair, and it has there a 

 distinct margin. Clypeus rovmded ; mandibles piceous. Length 

 4 mm. 



Hah. Mexico [Bilimik). 



If Foerster's ideas of the limits of genera are to be 

 carried out the above species should form the type of a 

 new genus, owing to the peculiar structure of the pro- 

 thorax. It comes, I think, nearest Psilodora. The 

 peculiar form of the pronotum is only an extreme 

 accentuation of what we have indications of in other 

 species of Eucoelides. 



Megapelmus mexicanus, n. s. 

 Black ; legs rufous ; the coxse at basal half, basal three-fourths 

 of hind trochanters, and the four hind femora above and beneath, 

 black. Wings hyaline ; nervures blackish ; radial cellule longer 

 than broad. Antennae longer than the body ; the flagelhim faintly 

 fuscous on lower side at base ; the 3rd joint a little longer than the 

 4th. Sutures on mesonotum shining, microscopically aciculate. 

 Scutellum rather flat, but still raised in the centre ; at the apex it 

 has rather an abrupt slope, as has also the metathorax ; the apex 

 of the scutellum has a distinct border above, and this border goes 

 also along the sides, but it is much more distinct at the apex, 

 where it is elevated above the rest of the scutellum, which, in 

 front of it, is depressed. The transverse carina in front of the 

 scutellum is distinct. Petiole nearly one-half the length of the 

 abdomen. The sides of the head and of the thorax covered with 

 a longish white pubescence. Length, 4 mm. 



Closely allied to the European M. eucharoides, Dalm., 

 but differing in having the radial cellule narrower ; the 

 sutures on mesonotum not crenulated ; scutellum longer 

 and flatter and much more distinctly margined behind. 



Hah. Mexico {Bilimik) ; Vienna Museum. 



TRANS. ENT. SOC. LOND. 1884. — rAKT IV. (DEC' 2l 



