OF WASHINGTON. 169 



ocelli is merely transversely striate, whereas in E. vigilans it is punc- 

 tured, the punctures running in rows between the striae, or, more prop- 

 erly, raised lines. 



Boulder, Colo., evidently parasitic on Formica subpolita. 



A NEW GALL-MAKING COCCID ON ATRIPLEX. 



BY T. D. A. COCKERELL AND S. A. ROHWER. 



In October, 1896, in the outskirts of Las Cruces, New 

 Mexico, Prof. C. H. T. Townsend found a bush of Atriplex 

 canescens on which were many small leaf-galls. The senior 

 author studied these at the time, and later collected additional 

 material, but was not able to come to a definite decision as to 

 the gall-maker. The galls all contained remains, more or less 

 imperfect, of what appeared to be an Eriococcus, but the 

 material was somewhat old, and had been very much injured 

 by both chalcidid and dipterous parasites. Moreover, the 

 locality was exactly the type-locality of Eriococcus neglectus 

 Ckll., and it seemed possible that we had to do merely with 

 some E. neglectus which had crawled into galls otherwise made. 



This unsatisfactory conclusion could not be modified until 

 this year, when Mr. L. C. Bragg rediscovered the galls on 

 Atriplex canescens at Trinidad, Colo. Mr. Bragg has sent us 

 good material, and there appears to be no doubt that we have 

 to do with a distinct and undescribed gall-making coccid. 



ATRIPLICIA, n. gen. 



Female gall-making; having the general structure of Eriococcus, 

 but with only bristles, the spines of Eriococcus absent. Antennae 

 7-jointed, formed as in Eriococcus, the last joint not the longest; caudal 

 tubercles long and cylindrical ; anal ring with 8 hairs ; legs well devel- 

 oped, the tarsus (excluding claw) a little longer than tibia. 



Atriplicia gallicola, n. sp. 



Oval, about 1.5 mm. long, reddish pink when fresh, turning dull 

 crimson when boiled in caustic potash ; not enclosed in an ovisac. Skin 

 with scattered bristles, not numerous. Antennae and legs red-brown, of 

 ordinary form, the claws long. Caudal tubercles cylindrical, about 

 30 M long and 20 M broad at base, emitting a long bristle (about 105 M). 

 Antennae 7-jointed, the joints measuring in p (i) 20-25, (2) 22-25, 

 (3) 33, (4) 28, (5) 18, (6) 15, (7) 28. The tibiae are about 77 (an- 

 terior leg) to 100 (hind leg) M long, the tarsi 80 to 105 M. 



