488 Descriptions of Tenthredinidce and Cynipida. 



Ihalia ruficollis, n. s. 

 Black ; the greater part of the pronotum, tegulse, and abdomen 

 red. "Wings fuscous. Antennae thin ; the basal joint four times 

 as long as the 2nd ; the 3rd a little shorter than the 4th. Head 

 rugose, the sides strongly striated ; a carina runs from the outer 

 ocelli to the base of the antennae, forming a somewhat square area, 

 having a keel in the centre, and from this central keel strong 

 striations run obliqiaely to the sides. Mesonotum very strongly 

 transversely striated, the sides and pronotum more finely and 

 obliquely ; at its junction with the mesothorax the pronotum is 

 strongly margined, the margin projecting over the mesonotum, 

 especially at the middle, which is indented ; mesopleura hollowed, 

 finely punctured. Scutellum transversely striated, like the meso- 

 notum, its sides margined, the margin at the apex indented like 

 the pronotum. In the centre of the metanotum is a shield-shaped 

 area, longer than broad, smooth and shining, and with a straight 

 keel in its centre ; from this area some keels run obliquely down 

 the sides. Over the hind coxae is a broad tubercle, which ends in a 

 moderately sharp point. Below the hind wings is a reddish mark, 

 touching the suture of the mesoj)leura, which is smooth and 

 shining opposite it. Petiole short, broader than long, smooth, 

 shining. The 2nd segment of abdomen longer than 3rd, which is 

 of the same length as 4th ; the 5th a little longer ; 6th on the 

 upper side a little longer than the three preceding together. The 

 head and thorax covered with a pale pubescence ; legs with a 

 longer and stiffer pile of the same colour. Length, nearlj' 12 mm. 



The striations on the mesonotum are wide apart, and 

 have the space between them smooth and shining. The 

 lateral sutures of the mesonotum are deep, wide, smooth, 

 and shining ; the central becomes indistinct beyond the 

 middle. 



Hah. Pinos Altos, Chihuahua, Mexico (Buchan-Hep- 

 hurn). 



