242 Illinois State Labm^atory of Natural History. 



maining upper lateral thoracic areas distinctly more- 

 coarsely striated than the areas below them, and quite 

 shining; abdominal lateral areas more finely striate, 

 feebly shining, microscopically striate on the posterior 

 portion of each area. Dorsal and ventral areas shining, 

 with sparse marginal striae interrupted on the disks, 

 those of thorax especially smooth. 



Dull annuli broad, including the false feet, a distinct 

 transverse dorsal and ventral pale spot in front of th&^ 

 false feet. Lateral prothoracic area occupied by a very 

 pale fuscous opaque quadrate spot in front of the striated 

 area. Meso- and metathoracic lateral stripes usually 

 visible, but slender, not dilated, lateral edges of dorsal 

 areas diverging; lateral stripes of abdomen almost want- 

 ing, except on last two or three segments. Last seg- 

 ment with bases of respiratory tube and anal prominence 

 ringed with opaque fuscous, that around anal prom- 

 inence sending up an indistinct stripe, with posterior 

 extensions. Pubescence of false feet whitish or pale fus- 

 cous. Respiratory tube slender, no spine protruding. 



T. atratus Fabr. [Fig. 50-56.] 



The larva of this abundant species has been carefully 

 described by Walsh,* and Riley has desci'ibed. and figured 

 the different stages.f The larvee were taken in every 

 month of the season except June, at which time they 

 had mostly reached the pupa or imago stage They 

 seemed to prefer the sandy shores, and were taken abun- 

 dantly May 17 at Station C, by running through a 

 coarse sieve the surface layers of sand of the shore near 

 the wave-washed margin. The same process was repeated 

 June 25, and not a single larva was found. Individuals 

 placed in breeding-cages failed to transform, but a pupa 

 was collected June 30, from which the imago appeared 

 July 17. A cast pupal skin was also picked up July 18, 

 One imago was seen about May 23, and in June they 

 were taken on the 12th and 22d. 



•Proc Bost. Soc. Nat. Hist., Vol. IX.. p. 304. 

 t Second Missouri Report, p. 128. 



