THE CANADIAN ENTOMOLOGIST. 45 



SOME NEW NEM'aTID SAWFLIES FROM COLORADO. 



BY S. A. ROHWER, BOULDER, COLORADO. 



The following descriptions are based principally on material collected 

 by myself during the past summer. One new species is described from 

 the collection of the Colorado Agricultural College ; the rest are in my 

 own collection. 



Many thanks are due to Professor T. D. A. Cockerell for going over 

 all the descriptions. The work is a contribution from the laboratory of 

 Systematic Zoology in the University of Colorado. I am greatly indebted 

 to Professor C. P. Gillette for the loan of the collections belonging to the 

 Colorado Agricultural College. 



The following descriptions of Ponta7iia galls seen at Florissant, Colo- 

 rado, may be of some use. On Salix brachycarpa, Nutt. : (r) Monothala- 

 mous ; springing from lower side of leaf ; arranged along the midrib; 

 globular; colour pale pinkish ; measurements before maturity 8 mm. (2) 

 Monothalamous ; bisecting leaf; attached near petiole in clusters of two 

 to four ; bright rose colour above, pinkish below ; measurements before 

 maturity, 10-12 mm.; similar to F. resinicola. Marl. \no\\\^x Potania g2\\ 

 on Salix sp., is much like P. Brufieri, Marl, but did not bisect the leaf, 

 and was attached along the midrib; only one monothalamous gall on each 

 leaf The Salix belongs to Longifolice as defined by Dr. Rydberg in his 

 Flora of Colorado (Bui. 100 Colo. Agricultural College) and probably is 

 S. exigua. 



Pontania leucostoma, n. sp.^c(. Length, 5 mm. Moderately robust; 

 head nearly as wide as thorax ; clypeus shallowly. circularly emarginate, 

 lobes broad, rounded ; ocellar basin distinct, walls rounded ; antennal 

 fovea broad, shallow, elongate ; antennae extending beyond thorax, third 

 and fourth joints equal, fifth shorter ; joints somewhat nodose at tips ; 

 vertex back of ocelli with a itw well-defined punctures ; mesolhorax above 

 with a few small, more indistinct punctures. Venation of primaries nor- 

 mal ; secondaries with the lower discal cell longer and wider than upper, 

 claws deeply notched^ inner ray shorter and somewhat slender. 



Colour in general shining black; face below antennae, except two black 

 spots below antennae, clypeus, labrum, mandibles, except tips w^hich are 

 piceous, posterior angles of pronotum, tegulse, base of co.sta, apex of ante- 

 rior coxae whitish ; posterior orbits, upper orbits, inner orbits narrowly, 

 apex of four hind coxae, trochanters (coxse and trochanters are inclined to 

 pallid), meso-femora except a narrow line above, meso-tibiae, meta-femora 



February, 1908 



