254 H. L. SHANTZ. 



20, 21, 22). They are practically identical with the illustration 

 of the caudal appendages of B. palndosa as given by Sars (1896 

 PI. VI., 10). 



Packard's original description of B. Lindahli (1883 : 339) is 

 the only one known to the writer. For this description Packard 

 had only the collection made at Wallace, Kansas, by Professor 

 Lindahl. This collection contained 10 females and only I male. 

 To judge from the description this male was an exceptionally small 

 one and evidently not a typical specimen. It therefore seems 

 best to give the more important specific characters of the male 

 of this species : 



Body long and slender, from 8 mm. to 17.5 mm. in length, 

 less robust than that of B. coloradensis ; second antennae long 

 and powerful, reaching to the base of the fifth or sixth foot, 2.2 

 mm. to 5 mm. in length, somewhat shorter than those of B. col- 

 oradensis ; first division 1.2 mm. to 2.9 mm. in length, thick and 

 provided on the outer margin with delicate sensory hairs, an ele- 

 vated toothed area near the base on the inner side ; shorter than 

 the first division of B. coloradensis, of about the same thickness 

 but lacking the prominent tubercle at the base ; second division 

 curved, shorter than the first, ratio to the first I to 1.36, the 

 outer surface flattened and meeting the arched inner surface in 

 two prominent angles. When viewed from the front or back, 

 less than half as thick as the basal division. The flattened outer 

 surface bends forward to the prominently inturned tip, which is 

 more flattened below than above. This dorso-ventral flattening 

 of the inturned portion causes it to appear very blunt when 

 viewed from above or below, but to appear rather gradually 

 pointed when viewed from the front or back. Eyes rather large, 

 0.325 mm. to 0.537 mm. in diameter, the ocular globe but 

 slightly better developed anteriorly than posteriorly, and not 

 much larger than the peduncle : much smaller than the eye of 

 B. coloradensis-- ratio I to 1.67; caudal appendages narrow- 

 lanceolate, length plus setae 1.62 mm. to 2.6 mm.; length of 

 appendage 0.975 mm. to 1.62 mm.; longer in proportion to the 

 breadth than those of B. coloradensis. 



This species can be distinguished easily from B. coloradensis 

 by the smaller eye and egg, by the difference in the shape of the 



