I92 UNIVERSITY OF COLORADO STUDIES 



KERMES, BOITARD 



Large (about 8 mm. long, 7} broad, 7 high), the dorsum with rounded tuberosities; 



larva very elongate (Colorado and Northern New Mexico) . . Gillettei, ckll. 



Smaller, the dorsum smooth (Colorado and New Mexico) . arizonensis, king. 



Note. — The species here referred to arizonensis has generally been referred to K. 



gallijormis, Riley. The insect is a variable one, and it is not yet certain how many species 



should be recognized in this group, or whether all the Rocky Mountain forms are reall 



arizonensis. 



Eriococcini 



Living in a gall on oak leaves in Southern New Mexico . . . Olliffiella, ckll. 



Not living in a gall ........... 1 



1. Anal ring without hairs; living on Cactaceae . . . Dactylopius, cost A 

 Anal ring with hairs ........... 2 



2. Anal ring with 8 hairs ; caudal lobes long . . Eriococcus, targioni-tozzetti 

 Anal ring with 6 hairs; caudal lobes rudimentary or absent Gymnococcus, douglas 



OLLIFFIELLA, ckll. 

 Antennae of adult female 6-jointed; skin with figure-of-8 glands . cristicola, ckll. 



DACTYLOPIUS, costa 



With much white secretion; insects producing a carmine stain when crushed. 

 (Colo., N. M.) ......... conjusus, ckll. 



Note. — D. conjusus occurs on Opuntia at Boulder, Colo. 



ERIOCOCCUS, TARGIONI-TOZZEETI 



Sac covering female waxy; antennae 6-jointed (on Atriplex canescens, New Mexico) 



. neglectus, ckll. 

 Sac oval, about 4 mm. long, white, covered with particles of sand; female antennae 



7-jointed; tibia and tarsus almost exactly the same length (on Psoralea micran- 



tha, Embudo, N. M.) arenosus, ckll. 



Sac normal, 1 closely felted; tarsus longer than tibia (they may be subequal in 



tinsleyi) ............ 1 



1. On Juniperus virginiana at Salida, Colorado; female antennae 7-jointed; sac 2-3 



mm. long; caudal lobes not distinctly prolonged . . . gillettei, tlnsley 



On Salix at Beulah, New Mexico; antennae 7-jointed, varying to 8; sac 2 £ mm. 



long; caudal lobes distinctly prolonged .... borealis, ckll. 



On Atriplex canescens in New Mexico, and a variety on Malvastrum coccineum 



at Denver, Colo. (Bethel); antennae 7-jointed, varying to 6; sac 4 mm. long 



tinsleyi, ckll. 

 On roots of Gutierrezia in northern New Mexico; antennae 6-jointed cryptus (ckll.) 



• Unknown in E. larrem; it is possible that this species does not form a sac, in which case it goes in the 

 genus Rhizococcus; it is so closely allied to E. tinsleyi in structure, however, that this seems unlikely. 



