VITTATE CHRYSOMELID BEETLES DISONYCHA — BLAKE 19 



half of elytra; surface alutaceous, indistinctly punctate; sutural, 

 median, and submarginal dark vittae not twice so wide as pale inter- 

 vening vittae; the submarginal and sutural vittae sometimes uniting 

 at apex. Body beneath finely pubescent, pale, the middle of the 

 metasternum, area about coxae, and most of the tibiae and tarsi dark. 

 Length 7.5 to 7.8 mm.; width 4 mm. 



Type: Male, and three paratypes, USNM 43651, from Teapa, 

 Tabasco, Mexico, collected in March by H. H. Smith. Other para- 

 types from same locality in BM and in MCZ (Bowditch collection). 



Other localities: Mexico: Tamazunchale, San Luis Potosi, 

 G. E. Bohart. 



Remarks: Under Disonijcha horni Jacoby are confused two species, 

 of which one is D. fumaia (LeConte) and the other this species. In 

 my earlier account of this I discussed the specimens in the collections 

 at length and disposed of the name horni as a synonym of D. fumata 

 (LeConte). D. ieapensis belongs to the aUernata group, having a 

 similar uneven pronotum and traces of elytral costae in the female. 

 It most closely resembles D. pluriligata var. pura, a Sonoran form. 

 D. teapensis, on the other hand, comes from the lowlands of south- 

 eastern Mexico. It is more slender than pluriligata, the head is 

 smoother, and the aedeagus has a broadly pointed tip, which is broader 

 than in any of the other species in that group that possess an acute tip. 



In the Bowditch collection are specimens from Jacoby's second 

 collection with the locality Zacualtipan, Hidalgo, Mexico, Hoge 

 collector, that are placed under Disonycha horni Jacoby but are 

 Horn's Disonycha tenuicornis. No mention of this locality is given 

 in the Biologia Centrali-Americana. 



Disonycha arizonae Casey 



Figure 33 



Disonycha arizonae Casey, Contributions . . . , pt. 1, p. 52, 1884. 



Disonycha glabrata Jacoby, Biologia Centrali-Americana, Coleoptera, vol. 6, pt. 1, 



p. 311, 1884 (in part). 

 Disonycha davisi Schaeffer, Joiirn. New York Ent. Soc, vol. 32, p. 141, 1924 (from 



New Jersey, type USNM 42426).— Blake, Proc. U. S. Nat. Mus., vol. 82, 



art. 28, pp. 29-30, 1933. 



Between 4.5 and 6.5 mm. in length, oblong oval, feebly shining, with 

 moderately densely punctate pro thorax and elytra ; pale ; usually with 

 a small dark spot on occiput and dark labrum, tubercles sometimes 

 dark; two anterior spots on prothorax; sutural, median, and submar- 

 ginal elytral vittae; apex of tibiae and tarsi dark. 



Head with interocular space more than half the width of head; 

 frontal carina not acute, broad and somewhat produced, tubercles 

 well marked but flat; middle of occiput and front usually smooth. 



