12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



33. Aedeagus with an acutely pointed dorsal tip (pi. 2, fig. 8)- alternata (p. 20). 

 Aedeagus with a broad dorsal tip (see pi. 2, fig. 9) pluriligata (p. 25). 



34. Median elytral vitta near submarginal vitta, with very narrow pale space 



between alabamae (p. 47). 



Median elytral vitta not conspicuously nearer to submarginal vitta than to 

 sutural vitta 35 



35. Head with interantennal area and tubercles flat and smooth, tubercles not 



at all swollen, and indistinct latifrons (p. 40). 



Head with frontal carina and tubercles distinct 36 



36. Head, viewed from above, with Interocular space half width of head 37 



Head, viewed from above, with interocular space more than half width 



of head 38 



37. Prothorax either entirely pale or with small median spot, occasionally with 



median spot and 2 lateral spots, all small, antennal joints not unusually 



long glabrata (p. 49). 



Prothorax with 2 anterior spots usually well marked, and often 2 lateral 

 ones and median stripe ; antennal joints 4 to 7 unusually long and 

 subequal fumata (p. 36). 



38. Elytra distinctly and rather densely punctate 39 



Elytra indistinctly and finely but not densely punctate 40 



39. Submarginal elytral vitta never reaching apex to join with sutural vitta ; 



aedeagus broad (see pi. 3, fig. 11) punctigera (p. 28). 



Submarginal elytral vitta joining at apex with sutural vitta ; aedeagus 

 narrow (see pi. 3, fig. 13) arizonae (p. 29). 



40. Head with broad dark occipital band, pronotum heavily marked with spots, 



the middle three sometimes coalescing, the lateral spots large; Colorado. 



brevicornis (p. 62). 



Head never with occipital band, pronotum never with well-marked 



lateral spots 41 



41. Small (5 to 6 mm), usually without pronotal spots; Atlantic coast to Great 



Plains admirabilis (p. 48). 



Larger (6 to 7 mm), prothorax with 2 well-marked anterior dark spots; 

 southern Arizona figurata (p. 35). 



DESCRIPTION OF SPECIES 

 1. DISONYCHA PENSYLVANICA (Illiger) 



Plate 1, Figure 1 



Haltica pensijlvanica Illiger, Mag. fiir Insekt., vol. 6, p. 146, 1807 (Pennsyl- 

 vania; type in Berlin University Zoological Museum). 



fGalleruca sexlineata Oliviek, Eutomologie, vol. 6, p. 642, 1808 (Bengal). 



Disonycha pensylvania Strum, Catalogue, p. 283, 1943. — Blake, Bull. Brooklyn 

 Ent. Soc, vol. 25, p. 210, 1930. 



Disonycha pennsylvanica Crotch, Proc. Acad. Nat. Sci. Philadelphia, vol. 25, 

 p. 04, 1873.— Horn, Trans. Amer. Ent. Soc, vol. 16, p. 202, 1889 (in part). 



Disonycha pennsylvanica var. parr a Blatchleji', Journ. New York Ent. Soc, 

 vol. 29, p. 16, 1922 (Knox County, Ind.). 



Description. — Small (5 mm), elongate oblong oval, shining, very 

 finely pimctate; elytra costate in female; head, legs, and body be- 

 neath dark except sides of prosternmn and last ventral segment; 

 prothorax with a single median .spot, this sometimes broadening to 



