NORTH AMKRICAN APTERA. 289 



spinous hairs. Palpi long, reddish brown, depth of color varying with that of 

 rest of body; tarsus distinctly blackish ; femur with a row of short conical tu- 

 bercles on its outer veutro-lateral surface, commencing near the base and run- 

 ning to the apical extremity, where there are about a dozen similar tubercles on 

 the ventral surface; another short, slightly oblique series on the dorsal surface, 

 beginning at the apical margin and extending backward about one-fourth the 

 length of the femur; patella with a row of tubercles on its outer ventro lateral 

 surface, similar to those on the femur, and a few obsolete ones on its dorsal and 

 ventral surfaces: tibia with two nearly parallel rows of tubercles, one on the 

 ventral and the other on the outer ventro lateral surface; a short row also on 

 the distal portion of its inner ventro-lateral surface; tarsus sparsely covered 

 with stiflf" hairs, and furnished with a well pronounced row of black tubercles on 

 its inner ventro-lateral surface. Ventrum reddish brown, with more or less of a 

 Vermillion tint in some specimens, with well-marked granulations. Legs brown- 

 ish black or black. Coxae slightly tuberculate, each having a row of short tu- 

 bercles on the cephalic margin. Shaft of genital organ slender, bent nearly at 

 right angles near distal end, and terminating in a very acute point. 



Female. — Body 8 mm. long; 5 mm. wide; palpi 5 mm. long. Legs: first, 22 

 mm. ; second, 41 mm.; third, 23 mm. ; fourth, 32 mm. Femur of first leg 6 mm. 

 Differs from the male in having the body thicker and more rounded, and in 

 having less reddish coloring. The palpi are much more slender, shorter, and 

 have the tubercles partially replaced by hairs; the tip of tarsus only is blackish. 

 The ventrum is sometimes grayish. The black central stripe is very distinct. 



Described from six specimens (3 S , 3 $ ) taken at Brookings, 

 South Dakota. 



The male of this subspecies is accurately illustrated in Trans. Am. 

 Ent. Soc. xix, plate 12. Its structural details are shown in fig. 2, 

 which was drawn from a specimen of the typical Liobunimi vittaium 

 of the Southern States. The idea of the general structural char- 

 acters of the female may be obtained from plate v, fig. 2, which also 

 represents a typical specimen from the South. 



The claims of this form to subspecific rank rest chiefly upon the 

 extreme shortness of the legs and its melanistic tendencies, the latter 

 being indicated by the intense blackness of the central stripe in both 

 sexes ; the unusual blackness of the legs of the female ; and the 

 blackish palpal tarsus. These characters are constant in and peculiar 

 to the specimens from the general region under consideration. 



L<iobuuuin loiigipes aldrichi, new subspecies (Trans. Am. Ent. Soc. 

 xix, pi. 14). 



Male. — Body 3.8 mm. long; 3 mm. wide; palpi 3.2 mm. long. Legs: first, 

 about 34 mm. ; second, 62 mm. ; third, about 35 mm. ; fourth, 46 mm. Dorsum 

 minutely tuberculate, light reddish brown, with a slightly darker subobsolete 

 central marking, sometimes simply represented by obscure, brown blotches; 

 margins of cephalothorax black. Eye eminence at least as broad as high, l)lack. 

 canaliculate, with rows of small, black tubercles on the carinae. Mandibles 



TRANS. AM. ENT. SOC. XX. (37) OCTOBER, 1893. 



