204 ENTOMOLOGICAL NEWS. [June, 



the species of that genus being, according to my experience, 

 arboreal. 



2. Eriococcus COCCineus n. sp. Female oval, shiny, plump, naked, dark 

 crimson (occasionally dull yellow), with short white hairs round the mar- 

 gin. Forms an oval, rather closely-felted white sac, which covers it; in 

 this, in March, the pale orange eggs are laid. Length of 9 , with sac, 3 mm. 



Antenna? seven-jointed, 3 longest, then 4, then 2 and i, then 5, 6, 7 sub- 

 equal, but of these three, 7 somewhat longest. Formula 34 (12) 7 (56). 

 A false joint slightly indicated in middle of third. Seventh blunt, rounded. 

 Antennae of nearly uniform width throughout, but slightly tapering dis- 

 tally. Legs well developed, pale brown. Trochanter with a hair; tarsus 

 longer than tibia; sides of body with stout, blunt spines. Mentum ap- 

 parently three- (certainly two-) jointed. Anal ring with six stout hairs, 

 which extend beyond the tubercles. The other two, if present, are less 

 developed; anal tubercles elongated and very distinct, each bearing a 

 couple of short hairs at its end. 



Hab. Native country uncertain, found on a " Rat-tail Cactus" 

 in a greenhouse at Lincoln, Neb. Sent by Prof. L. Bruner. 



This is the first Eriococcus found on any of the Cactaceae, and 

 it will not be difficult to distinguish it from any of the described 

 species. In its j-jointed antennae, and tibia shorter than tarsus, 

 it resembles E. raithbyi Maskell, found in New Zealand on Fagus; 

 but it differs from that insect, as might be expected, in a variety 

 of ways. 



The crimson form is typical; the dull yellow mutation may be 

 termed E. coccineus, form lutescens. E. raithbyi, similarly, is 

 sometimes yellow, sometimes red. In Dactylopius, some species 

 are always yellowish, while allied but distinct species are always 

 pink. 



ENTOMOLOGICAL NEWS for May was mailed April 30, 1894. 



