1923] 
A New Cockroach from South America 
29 
as thick as the basal one; fourth to fourteenth segments trans- 
verse, the fourth to the eleventh or twelfth being two or more 
times as broad as long, the more basal ones especially broad; 
fifteenth and sixteenth segments subquadrate and the suc- 
ceeding ones longer than wide, those towards the apex being 
twice as long as broad, some of them slightly more. 
Pronotum about twice as broad as long, broadly rounded 
anteriorly, truncate posteriorly, the lateral angles rounded and 
slightly produced posteriorly, as are also those of the meso- and 
metathorax, which segments are subequal with each other in 
length and together barely as long as the pronotum. Organs of 
flight entirely absent. Legs stout; femora fusiform, broad 
and flattened, the anterior pair somewhat smaller than the 
others, the intermediate pair about three times as long as the 
greatest width and the posterior ones a little stouter, being about 
two and one half times as long as broad; anterior femora armed 
beneath with a series of fine setiform hairs, the intermediate and 
posterior ones armed beneath on both margins with a few very 
minute spinules in the apical portion, so small as to be scarcely 
noticeable under moderate magnification, a subapical one on 
each margin being decidedly larger; all the femora have an 
apical calcar on the cephalic geniculation ; tibiai strongly spinose 
above, the spines in three series, and beneadh with mostly finer 
hair-like spinules, a couple of larger ones in the cephalic margin 
of the intermediate and posterior ones; tarsi slender, the posterior 
metatarsus barely shorter than the combined length of the rest 
of the segments; arolia present, of medium size. 
Abdomen anteriorly about as broad as the posterior width 
of the metanotum, abruptly narrowing posteriorly and scarcely 
as long as the combined lengths of the three thoracic segments; 
there are seven dorsal segments visible exclusive of the supraanal 
plate; lateral margins straight, the posterio-lateral angles 
sharp and moderately produced posteriorly; the posterior 
margins of the segments are subtruncate, that of the one pre- 
ceeding the supraanal plate concave near each side opposite the 
insertion of the cerci; supraanal plate somewhat more than 
twice as broad as long, rather narrowly rounded apically; sub- 
