MORSE: ORTHOPTERA OF NEW ENGLAND. 303 
"The Blattidae of North America north of the Mexican Bound- 
ary" (Mem. Amer. Ent. Soc, no. 2, 1917). This is an indis- 
pensable guide to the study of our members of this group of 
Orthoptera. A text-figure explains the terms used in con- 
nection with the venation of tegmina and wings, and ten 
plates of illustrations present numerous entire figures and 
many diagnostic details of structure. It contains also exten- 
sive data on distribution and many bibliographical references. 
For this reason the bibliographical references cited below are 
reduced to a minimum. 
Taxonomically, the family Blattidae is split up into a large 
number of subfamilies, varying with different authors from 
11 to 16. Of about Seven recognized from North America, 
representatives of four have been taken in New England. 
All but one of the species definitely known to be estab- 
lished in New England belong to the Blattinae (including 
Periplanetinae of some authors). The following key includes 
all established species but omits some of the adventive visitants 
captured every now and then as escapes from merchandise of 
tropical origin. 
Key to Species of Blattidae. 
(See Fig. 26-33.) 
A. Middle and hind femora armed beneath on one or both edges of posterior 
(ventral) margin with two or more distinct spines. 
B. Pronotum and tegmina clothed with microscopic silky pile. Large species, 
pronotum 12 to 14 mm. wide. Adventive Subfamily Nyctiborinae. 
C. A conspicuous yellow stripe covering front and side margins of pro- 
notum and extended on basal two-fifths of costal margin of tegmina, 
narrowed in front and tapering to a point posteriorly on the tegmina 
and margined exteriorly by a dark line of the ground color. Otherwise 
brownish fuscous, the tegmina brownish fuscous at base, grading to 
deep golden brown at tip. Apparently glabrous; the pile microscopic, 
invisible without lens. 
Yellow-striped Silky Roach, Nyctihora laevigata, p. 319. 
CC. No yellow on pronotum or tegmina; the latter golden brown; pile 
longer, visible without lens. . .Silky Roach, Nyctihora noctivaga, p. 319. 
BB. Pronotimfi and tegmina without pile Subfamily Blattinae. 
D. Large species; pronotum of female at least 9 mm. wide. 
E. Tegmina covering abdomen or exceeding it. 
