ART. 28 REVISION OF DISONYCHA NORTH OF MEXICO BLAKE 17 



Crotch's pallipes is uniguttata because of a character in Crotch's 

 key — " thorax * * * with a marked callosity." Crotch's key is 

 not a regularly constructed one with appositional statements, and 

 either uniguttata or procera can be deduced from it. Therefore it 

 seems best to regard pallipes Crotch as a doubtful species and apply 

 Casey's name procera to the species under discussion. 



This species, the type of which is a female, corresponding exactly 

 to Casey's description, is usually smaller than uniguttata and has 

 much finer punctation. The elytral costae are well developed in 

 the female, which is not true of uniguttata. The prothorax has a 

 slight trace of lateral callosity as in both pensylvanica and conjugata^ 

 but this is not so well developed as in uniguttata. In markings it 

 is very similar to uniguttata', the head is bicolored, the elytral vittae 

 are wide, the legs and margin of the abdomen are red. The pro- 

 notum, however, in eastern specimens is often entirely pale, or with 

 five indistinct spots. There is a dark variety of this species occurring 

 in the Rocky Mountains and Northwestern States and also in Lou- 

 isiana and Texas, in which the spots on the pronotum are often 

 banded together, and the legs and undersurface are frequently dark 

 or partially dark. These specimens are difficult to distinguish from 

 pensylvanica except by comparison of the aedeagi. Mr. Schaeffer 

 has described this dark form as D. nigriventris, one paratype of 

 which, a male, is in the United States National Museum. He states 

 that the aedeagus is different from anything figured by me, but a 

 dissected specimen that he has sent me shows that the aedeagus is 

 not different from that of the eastern specimens of procera. My 

 drawings of the aedeagi have been made for the most part from ma- 

 terial soaked in caustic potash (which causes the softer membranes 

 to become swollen), and later mounted in balsam. Mr. Schaeffer's 

 dried specimen differs from the specimens mounted in balsam in 

 being less swollen, owing to the different methods of preparation. 



4. DISONYCHA UNIGUTTATA (Say) 



Plate 1, Figure 4 



Altica iinigutiata Say, Journ. Acad. Nat. Sci. Philadelphia, vol. 4, p. 88, 1824 



(United States; type lost). 

 f HoMlco vicina Kirby, Fauna Boreali Amer., vol. 4, p. 217, 1837 ("Lat. 05° ", 



Canada; type lost). 

 Disonycha uniguttata Melsheimeb, Catalogue, p. 122, 1858. — Blake, Bull. 



Brooklyn Eat. Soc, vol. 25, p. 212, 1930. — Schaeithsi, Journ. New York But. 



Soc, vol. 39, p. 2S2, 1931. 

 fDiwnycha limbicoUis var. pallipes Crotch, Proc. Acad. Nat. Sci. Philadelphia, 



vol. 25, p. 64, 1873 (type lost). — Schaefb^ek, Journ. New York Ent. Soc, 



vol. 39, p. 282, 1931. 

 Disonycha pennsylvanica. Horn, Trans. Amer. Ent. Soc, vol. 16, p. 202, 1889 



(in part). 

 175870 — 33 :5 



