ART. 2S REVISION OF DISONYCHA NORTH OF MEXICO — BLAKE 51 



tomentosa and without locality. In 1792 the original long descrip- 

 tion under the name gldbrata was repeated, with the locality this 

 time given as Jamaica, and in his treatment of glabrata in 1801 Fab- 

 ricius again gave the locality as Jamaica. From the original de- 

 scription (1775) it is plain that Fabricius had before him something 

 quite different from Linnaeus' C hrysomela tometitosa, Avhich is prob- 

 ably some species of Galeinicelkir'' The original descrijjtion of gla- 

 hrata applies in every way to the Disonycha to which the name 

 glabrata is now given. 



This species is widely distributed. It is found throughout Mexico, 

 Central America, and into South America, and in the West Indies. 

 In the United States it occurs as far north as New York and Illinois 

 and west to Arizona. The Arizonan and sometimes the Mexican 

 specimens are paler. In them there is only a spot on the occiput, 

 the pronotum is sometimes immaculate, the usually distinctive black 

 marginal vitta does not cover the margin, the other vittae are often 

 narrower, and the undersurface and epipleura are pale. The elytra! 

 punctation of the southern specimens is also not as deep. Otherwise, 

 in its wide range, the species presents little variation. D. glabrata 

 is not closely related to any other North American species but is 

 allied to two Mexican and Central American species, D. dorsata 

 Jacoby and D. nigrita Jacoby.^* 



One of the specimens of the Biologia material in the National 

 Museum labeled glabrata is D. arizonae Casey, indicating that 

 Jacoby may have confused that species with glabrata in his treat- 

 ment of Disonycha of Mexico and Central America. 



23. DISONYCHA MARITIMA Mannerheim 



Plate 6, Figtjre 31 



Disonycha maritima Mannekheim, Bull. Soc. Imp. Moscou, vol. IG, p. 311, 1843 

 (California). — Crotch, Proc. Acad, Nat. Sci. Philadelphia, vol, 25, p. 64, 

 1873.— Horn, Trans. Amer. Ent. Soc, vol. 16, p. 206, 1889. 



Deseription. — Small (4 to 5 mm), broadly oblong oval, somewhat 

 shining, densely punctate, pale with dark labrum and occipital spot 

 extending down front, and sutural, median, and marginal vittae 

 covering most of the elytra; undersurface dark except prosternum 

 and last ventral segments. Head with interocular space a little over 

 half width of head; frontal carina narrow, slightly produced; oc- 

 ciput and front as far as tubercles usually densely and coarsely punc- 

 tate, sometimes with a smooth median area; pale with black occipital 

 spot extending down front and a darkened labrum. Antennae dark 



^ Blake, Revision of the species of beetles of tlie genus Trirhabda north of Mexico. 

 Proc. U.S.Nat.Mus., vol. 79, art. 2, p. 13, 1931. 



=s Blake, Bull. Brooklyn Ent. Soc, vol. 116, p. 7G, 1931. 



