IN NEW MEXICO. 11 



of their structure shows them to be specifically distinct. This 

 species may be distinguished from A. rapax by the following char- 

 acters of the last abdominal segment of the female : Four groups 

 of spinnerets (none in A. rapax)', the superior lateral groups con- 

 sist of about seven, and the inferior lateral groups of about four 

 spinnerets. 



Food-plants. Very common in California on the bark of the 

 trunk and limbs of the native willows. It has been found in great 

 numbers here on the bark of trunk and branches of our native 

 cottoiiwood (Populus fremontii). The bark of the trunk of one 

 tree was entirely covered. It has also been found here in great num- 

 bers on the limbs and twigs of an ash (Fraxinus sp/). 



Parasites. Great numbers of the scales on cottonwood showed 

 minute holes from which some hymeiiopterous parasite had emerged. 

 There were no living insects under such scales, showing that the 

 parasite had done much good work in keeping the scales in check. 

 Those on ash were also well parasitized. 



NO. iv. CHILOPSIS SCALE ( Aspidiotus n. sp. ?). 



This species bears some resemblance to Aspidiotus nerii 

 Bouche, but is probably a new species. Professor Comstock, after an 

 examination of specimens, writes that it is an Aspidiotus unknown 

 to him, and probably undescribed. Further material is necessary 

 before a description can be drawn up, therefore nothing more than 

 a mere notice of its occurrence is given here. -__ . 



Food-plants. This species was found plentifully infesting the 

 leaves, mostly on the upper side, of a bush of Chilopsis saligna in 

 the yard of Hon. A. L. Christy, of Las Cruces, who first called my 

 attention to this scale. At date of examination, August 25, 1891, 

 the scales were nearly all very small, and some orange-yellow young 

 were seen outside. There were a few larger scales, containing eggs 

 beneath them. The scales seemed to be confined to the leaves. 



NO. v. THE LOCUST SCALE (Lecanium robiniae Riley MS.). 

 This is an entirely different scale, in appearance and size, from 

 all of the preceding species, which belong to the genus Aspidiotus. 



