THE CANADIAN ENTOMOLOGIST. 93 



wing, occasionally with the inner edge just j-jrojecting into the white area ; 

 on the costa just beyond reniform a large white quadrate patch from the 

 base of which the geminate t. p. line arises and bends sharply inward 

 below reniform and orbicular, almost reaching the margin of the dark 

 area of wing ; from a point below the orbicular it turns towards the inner 

 margin, forming two lunulate marks, the upper being the larger ; the space 

 beyond the t. p. line is almost entirely filled with bluish purple ; s. t. line 

 indistinct, marked wiih creamy at costa and in central area, incurved at 

 vein 2 ; a broken terminal dark purple-brown line ; fringes bluish purple, 

 cut with white opposite cell and between veins 2 and 3. Secondaries 

 whitish with narrow smoky border in ^ , almost entirely smoky in Ç ; 

 fringes pale. Beneath, primaries smoky with the white patch of upper 

 side marked in ochreous. Secondaries suffused with pale smoky brown, 

 with a discal spot and indistinct postmedian line angled sharply opposite 

 the cell. Expanse, 27 mm. 



Habitat : White Mts., Ariz., 3 ^ s, 5 9 s. Types, collection Barnes. 



Closely related to a?'e/i Stkr,; differs in the much larger size of the 

 white patch and the fact that the orbicular is not contained within the 

 light area of wing. 



(To be continued.) 



THE OLDEST AMERICAN HOMOPTEROUS INSECT. 



BY T. D. A. COCKERELL. UNIVERSITY OF COLORADO. 



With very (ew exceptions, ihe cretaceous strata of North America, so 

 rich in various organic remains, have failed to yield insects. A cockroach 

 from the Judith River Beds in Montana has been described as Stantoni- 

 ella cretacea (Handlirsch). A Protoblattoid from the Kootanie of Mon- 

 tana is called Lygobius knoivltoni Mitchell. Beetle remains named 

 Archiorhynchus angnsticoUis Heer, Ciircidiopsis cretacea (Heer), and 

 Elytrulum multipimctatiim (Heer), are from the lower cretaceous of 

 Greenland, while one from the Pierre formation of Manitoba is named 

 Hylobiites cretaceus Scudder. Egg^-masses from the Laramie Beds of 

 Colorado are called Corydalites fecundus Scudder. Considering the 

 enormous time represented by the cretaceous, and the richness of the 

 flora, it is certain that there must have existed a succession of insect- 

 faunse including innumerable types, almost all of which are now unknown 

 to us. This is particularly unfortunate, because during this period the 

 modern families of insects must have been in course of evolution. 

 Tertiary insects we have in abundance, but they are not old enough to 



March, 1912 



