76 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



ISOTOMURUS PALUSTKIS (MUller) variety BALTEATUS (Renter) 



Isotoma balleata Reuter, 1876, p. 82. 



Isotoma palustris var. balteata Absolon, 1900a, p. 30. — Schott, 1894, p. 66; 



1896a, p. 184.— VON Dalla Torre, 1895, p. 10.— Reuter, 1895, p. 26.— 



ScHAFFER, 1896, p. 186; 1898, p. 402.— Scherbakov, 1898a, p. 58; 1898b, 



p. 7. — Philiptschenko, 1905, p. 4. 

 Isotoma palustris var. cincta Kraxtsbauer, 1902, p. 40. 

 Isotomurus palustris var. balteata Linnaniemi, 1912, p. 189. — Handschin, 1929, 



p. 73. 



Description. — Ground color yellow, sometimes whitish. Body seg- 

 ments (except prothorax) broadly banded with dark blue or blacldsh; 

 the unpigmented posterior region of each segment appearing as a 

 yellow or white band. Vertex with a median black spot. Antennal 

 base black. Antennae and legs variable in the amount of pigmenta- 

 tion. Sternum and furcula unpigmented, or latter pigmented basally. 

 Length, 1.25 mm. 



Remarks. — Some of my specimens from Louisiana show a trace of a 

 median dorsal black line. 



Small individuals from Florida are pale yellow, with pale purple 

 antennae. 



On one occasion I observed a coleopterous larva, determined by 

 Dr. A. G. Boving as a species of Stenus, holding one of these collem- 

 bolans between its jaws. 



Distribution. — This well-marked variety of palustris has been re- 

 corded from Finland, Russia, Hungary, Bismarck Ai"chipelago and 

 California. 



Maryland: College Park, March, in a greenhouse, E. N. Cory. 



Florida: Gainesville, January 12, in decaying leaves in moist hammock, T. H. 

 Hubbell. 



Illinois: Homer, April 17, on rain-water pool on grass. 



Iowa: Burlington, July, J. E. Guthrie. 



Louisiana: Tallulah, March 31, April 2, 4, under a log on grass. 



California: Lake Chabot, near Oakland, G. Eisen (California Academy of 

 Sciences). Palo Alto, V. L. Kellogg and L. M. Bremner (Stanford Univer- 

 sity). 



British West Indies: Grenada, August 25, on grass growing through water, 

 H. E. Summers. 



ISOTOMURUS PALUSTRIS (MuIIer) TEXENSIS. new variety 



Plate 25, Figures 282, 283 



Description. — Ground color yellow. Markings dark blue to black. 

 Antennal bases black, connected by a black line. Vertex with a 

 median black spot. Body with a broad median dorsal black stripe, 

 with irregular margins, extending back as far as the third abdominal 

 segment; also a pair of broad irregular subdorsal stripes. Abdominal 

 segments with lateral black markings. The last four abdominal seg- 

 ments have a dorsal pattern that is variable, but essentially as in 

 plate 25, figures 282 and 283. First antennal segment pale, or dark 



