54 EDWARD P. VAN DUZKE. 



them from custator. For the pre^^eut I prefer to leave them without 

 further attempt at discrimination. 



Tliyaiita casta Sral. 



My specimens are from Hayti, but the species has been recorded 

 from California and Arizona by Dr. Uhler. I have distinguished 

 casta from custator by the punctuation, which is coarser in casta, not 

 so deep and close, and the intervening surface is uneven, in places 

 irregularly calloused. It closely resembles the South American 

 patruelis in size and form. In my s^pecimens the margins of the 

 pronotum before the humeri are not distinctly pallid or luteous, but 

 the extreme edge in one specimen is slenderly blackish, a character 

 often found in not fully developed examples of custator. 



Tliyanta aiitigiieiii^is Westw. (te/iio/a Dallas). 



Dr. Distant announces (Proc. Zool. Soc, 1900, p. 812) what all 

 students of the Pentatomids must regret, that the awkward name 

 given by Westwood must supplant that of Dallas. I possess a good 

 series taken in Mexico and Hayti, the latter kindly sent to me by 

 Prof Elmer D Ball. This species varies in length like rugulosa 

 from about bh to 7 mm. In general appearance it most closely re- 

 sembles }j\uictiventris with which it agrees in its somewhat depressed 

 form. It may best be distinguislied by its coarse, deep, uniform 

 punctuation, and the testaceous band between the humeri. This 

 band is scolloped behind where it is margined with deep bi'own or 

 sanguineous. The head is about as long as in rugulosa and puucti- 

 ventris, but is more strongly narrowed toward the apex. The color 

 above is dark green, not bright bluish or pea green as in rugulosa 

 and brevis. Here the venter is paler, coarsely and sparcely punc- 

 tured with darker. In all my specimens the edge of the venter is 

 marked with four black points placed on the second to the fifth 

 incisures, and the tip of the scutellum is dull sanguineous. It has 

 been recorded from Arizona and California. 



Tliyaiita rugulosa Say. 



This species is exceedingly common on the dry arid prairies of 

 Colorado and Utah. While collecting in such localities in 1900 I 

 found it most abundant on a low species of Atraplax having a whit- 

 ish green foliage. On these bushes the insect assumes a green grey 

 color assimilating to the color of its surroundings. The insect which 

 I believe I have correctly identified as rugulosa has the head long, 



