250 



I. Sixth antennal joint much shorter than the first. 

 B. Sixth antennal joint nearly or quite twice as long as hroad. 

 1. First antennal joint as long as the fourth to the sixth joints 

 inclusive. 

 a. Furnished with both tegmina and wings. 

 * Antennae with more than twenty joints. 

 Labidura. Body flattened only in front, the abdomen tumid, 

 especially above. Antennse a li,ttle more than half 

 as long as the body, the first joint enlarging much 

 toward the tip ; prosternum of equal width in front 

 and behind. Tegmina and wings present ; first tar- 

 sal joint equal to the other two, the second simple, 

 third with no pad ', second and third abdominal seg- 

 ments without lateral plications; forceps moderately 

 stout, rather simple, slightly arcuate, distant at base 

 (<? ), or straight, incurved at tip, approximate ( 9 ). 

 1. riparia Pall. A very variable species, but usually with 

 the head dark castaneous ; pronotum and tegmina 

 dark fuscous, with an inner i)ale band; wings fuscous, 

 pale interiorly ; abdomen blackish above, castaneous 

 on sides and also on dorsum of last segment ; the legs 

 luteous; antennae with 27-30 joints ; forceps of male 

 with a slight tooth beyond middle of inner edge. 

 Length 20°^" ; forceps: <? generally about half the 

 length of body, but sometimes much more ; 9 5™"^. 

 Texas, Florida, Cuba, Mexico, (and nearly the whole 

 world). 

 [Labidura advena Mein. from Jamaica is unknown 

 I to me, and the description inaccessible.] 



** Antennae with less than twenty joints. 



PsALTS. Body stout, the abdomen rather tumid; antennae less 

 than half as long as the body, the first joint long and 

 increasing but little in size apically ; prosternum 

 broadening anteriorly. Tegmina and wings present ; 

 first tarsal joint equal to the other two, the second 

 simple, the third padless ; no lateral plications on 

 abdomen ; forceps slender, cylindrical, arcuate, 

 widely distant (c?), or stout, trigonate at base, attin- 

 gent, straight, and incurved at tip ( 9 ). 



r Wings extending conspicuously beyond the tegmina.. &. 

 a. } Wings extending but slightly beyond the tegmina, 



( 1. gagatina. 



i Tegmina with a light-colored spot on darker ground, 

 h. } 2. procera. 



( Tegmina unicolorous 3. americana. 



tl. gagatina Klug. Shining piceous, the thirteenth 

 and fourteenth and sometimes the adjoining joints of 

 antennae pale; tarsi and tibias rufous at the tip. Teg- 

 mina short; abdomen punctulate. Length 19" 

 forceps ^-S""™. Porto Eico. 



)mm 



