Localities in which Pellagra is Prevalent. Al 



side of the thorax just behind the head. Carinse of abdomen 

 brown. 



Metrobates hesperius.—A second species resembling the 

 preceding in a general way, but with the four long slender 

 tapering hind legs attached well back and close together, 

 was found on one occasion, August 31, 1911, in the water at 

 the edge of Cumberland River. It is a very alert species, 

 and somewhat difficult of capture. Two females and one 

 male were secured. 



It is broad oval in shape, the female 3.8 mm. long, the 

 male about the same in length, but much more slender and 

 with a protruding cylindrical terminal abdominal segment. 

 Wingless. Color black, a dull yellowish red spot on the 

 occiput, excised in front. Eyes reddish brown. A relatively 

 large bright yellow spot in the middle of the prothorax 

 above, touching the posterior margin, but not reaching the 

 anterior edge. Antennge black, yellow at base. Legs black, 

 bases of front pair and the presternum dull yellow. A yel- 

 low mark in front of the bases of the middle legs. Under a 

 lens a blue-gray longitudinal band is seen to extend along 

 the middle of the thorax above. Another similar well- 

 defined area extends along the sides. At the edges of the 

 abdominal somites also the same color appears, and much of 

 the ventral surface is so colored. 



This insect resembles another water strider, Trepobates 

 pictus, collected by me in 1889 and subsequently in rocky 

 streams at Lexington, but the latter is elaborately marked 

 with yellow and is more slender. Other larger species of 

 the group Hygrotrechus remigis and Limnotrechus margin- 

 atus, are common in most streams in Blue-grass Kentucky. 

 They are predatory insects, feeding upon flies and other 

 insects that become stranded on the surface of water. As 

 far as known they have no objectionable traits. 



COLEOPTERA (BEETLES). 



In most quiet fresh waters are to be found numbers of 

 flattish beetles which swim well by means of their legs, 

 which are in many cases expanded and fringed for the pur- 



