THE CANADIAN ENTOMOLOGIST, 129 



and a black dash inferiorly, which ferrughioides has not, and its annulus 

 is scarcely denned. The reniform contains inferiorly three black spots. 

 The black dashes which mark the tips of the veins in this are not present 

 in ferrughioides, and the fringes are more heavily cut with blackish in the 

 former. In ralla the secondaries are pellucid, and without a trace of lines 

 above, while in the other they show a median line, a subterminal band, 

 and are fuscous toward their internal margin. 



In view of the marked differences in the two species, it is believed 

 that their pronounced identity is based on an erroneous determination of 

 ralla or a simple recollection of its general appearance. It is much to 

 be deplored that synonymical dicta so frequently find their way in 

 print, to our perplexity or annoyance, manifestly wanting in the authority 

 of critical observation or the use of available means of information. To 

 such a neglect we are disposed to refer the recent union, as " dimorphic 

 forms," of three well denned species of Agrolis, viz., subgotkica, hcrilis 

 and tricera — entirely unsupported by observations and experiments such 

 as have placed the polymorphic and dimorphic forms of Papilla ajax, 

 Grapta inierrogationis and Lyccena pseudargiolus of Edwards, outside of 

 the field of conjecture or prejudice, in a region of absolute certainty. 



INSECTS OF THE NORTHERN PARTS OF BRITISH AMERICA. 



COMPILED BY REV. C. J. S. BETHUNE, M. A. 



From Kir by s Fauna Boreali- Americana : In sect a. 



(Continued from Vol. vii, p, 113.) 



[250.] II.— ORTHOPTERA. 



FAMILY LOCUSTID.E. 



344. Locusta leucostoma Kirby. — Length of body 13^ lines. A 

 single specimen taken in Lat. 65 . 



Body obscurely rufous, clouded with darker shades. Upper lip, and 

 large spot of the mandibles, white; palpi reddish, with the two last joints 

 whiter, summit black ; antennae as long as the trunk, which on the upper 

 side is subpubescent ; last segment of the prothorax carinated ; tegmina 



