2()t 
KE(’()HI)S OF BLATTIDAE (oKTIIOPTERA) 
joint- l;irK(^ and clonsate, nearly as long as (or in paratype as long as) fourth 
joint; fourth joint elongate, slightly shorter than third. Pronotuin as char- 
aeferistie of genus, greatest width ineso-caudad, surfaee weakly convex and 
showing weak lateral deflection. Tegniina and wings fully developed, vena- 
tion as characteristic of genus, costal veins slightly heavier distad. Abdomen 
with sixth tergitc having a deep semicircular dei)ression mesad, bearing a scant 
fringe of hairs on its cephalic face, caudad of which the segment is raised in 
a large blunt knob, with surface cephalo-dorsad covered with a heavy tuft 
of somewhat agglutinated, short hairs, these parting from the medio-longi- 
tudinal fine and directed cephalo-laterad, caudal portion of tergitc subchit- 
inous mesad. First to sixth tergites with latcro-caudal angles weakly i)ro- 
duced, forming a rounded angle of slightly less than ninety degrees, this 
larger for sixth tergitc; succeeding tergites decidedly constricted, more so 
than in InrifrouH. Supra-anal plate transverse, very weakly triangularly 
produced, with ai)ex weakly bilobate. Subgenital plate of type characteristic 
of genus; disto-mesal section protluced, directed upward, rounded and bluntly 
angulatc sinistro-distad; the lateral sections are similarly directed upward 
with hinged styles lying along the margins of the median production, tlie 
dextral much heavier than the sini.stral, the bluntly rounded apices of these 
attingeid. and curling caudad; within, from t.he base of the sinistral style, a 
more strongly chitinous, cylindrical process is directed dorsad, its blunt ai)ex 
flattened out caudad on a plane with the dorsal margin of the sinistral styhu 
Limbs as cliaracteiist-ic of the genus, 'rarsal claws very strongly a.symmel,- 
rical, the shorter not extending as far as the large ])idvillus .^2 
AUoIi/ih’. — 9 ; San Jorgje, Low(‘i' Ctilifornia, (Mexico. [Hebard 
Oolh'cl ion.] 
■Agri'cs with type in color ])attern, asymmetry of tarsal claws and other 
f(‘atur('s, excepting the following. Size smaller. Interocular sjaice much 
wider, four-fift hs that between the aidennal sockets, ocellar areas less di.s- 
fiuet and o(!cllar spots smaller. Pronotum with i)oint of greatest width 
iK'arer the mon; truncate caudal margin.^’ Tegmina and wings greatly re- 
duced, but extending to near base of supra-anal i)late. Tc'gmimi narrow, 
elongate oval.'' Dorsnl surface' of abdomen neither specialized or coii- 
d’h(‘ degrei' of asymmetry of t he tarsal claws aieja'ars to be one oi the 
most useful characte'rs in distinguishing the si)ecies of this genus. It is evi- 
dent that Ldtihldltclld inehuh's a, number of sjeecic's, all of very similar type 
even in smili (eharactors as the specialization of the male tergites and sub- 
genital plate. NoiU! of th('S(^ sp('ci('s have nweakul distinctive characters 
not. sharc'd by th(! otlu'rs, and differences of degree, such as of form, of t('g- 
miiial and wing ih'.vc'lopment and of aiuount of asymmetry shown by tin; 
tarsal claw's, arc; thus of gn'at imi)ortance. d'lu' male concc'aled genitalia 
will, very possibly, show individual diagnostic characters, but there is not 
sullicic'iit. mat('rial of many of th(' species available to determine this. 
^\■e 1 lave found that this change in jironotal form is almost always a 
direct response to great ri'diiction in the' organs of flight. 
" .Much as figured for “'rciiuidplcfij.r Icdupidiia" Saussure atnl Zc'lmtner, 
Biol. (jeiif.-Am., Orth., i, pi. i\, fig. 21, (IS!):!}. 
