320 NEW YORK STATE MUSEUM 



fig.17] ; the anterior tergal setae of the mesothorax and meta- 

 thorax divided into three groups, those of the first six abdominal 

 segments continuous and connected with the supraspiracular 

 setae, those of the seventh segment continuous, but with their 

 lateral extensions widely separated from the supraspiracular 

 setae, the posterior tergal setae of the mesothorax distinct from 

 all the other groups, those of the metathorax with their outer 

 ends curving cephalad and slightly coalescing with the anterior 

 tergal setae, those of the first five abdominal segments continu- 

 ous and straight and of about the. same length as the anterior 

 tergal setae, those of the sixth abdominal segment only slightly 

 separated from the supraspiracular" setae, which in this seg- 

 ment extends much farther caudad than in the others, those of 

 the seventh abdominal segment curved and extending from one 

 spiracle to the other; the supraspiracular setae broad, well 

 marked, those of the seventh segment small, consisting of only 

 a few setae; the infraspiracular setae of medium size and ob- 

 lique, those of the seventh segment behiudithe spiracle and near 

 the apex of the posterior tergal setae; the anterior and posterior 

 sternal setae of the thorax distinctly separated and divided lon- 

 gitudinally into two groups, the sternal setae of the first five 

 abdominal segments square in outline and continuous, those of 

 the sixth and seventh segments divided longitudinally into two 

 groups; the pedal setae well marked and not joined to the ster- 

 nal setae [pl.29, fig.3]. 



Pupa. White; legs, wing pads, and antennae not closely at- 

 tached to the body; the second and third segments of the an- 

 tennae subequal; the pronotum not with an impressed line nor 

 tuberculate on the side in front; the first ventral abdominal 

 segment as long as the next four. Length, 9mm; width, omm. 



Cocoon, Brownish; oval in outline; and attached along the 

 middle line of the leaf of a sedge. Length, lOram; width, 5mm. 



Described from numerous specimens loaned by the United 

 States National Museum and probably collected by Messrs Hub- 

 bard and Schwarz on rushes along the Detroit and St Clair 

 rivers in August 1873. 



Donacia porosicollis 



Egg. l^mm in length; opaque Avliite in color; each end bluntly 

 rounded, the sides subparallel, naked, not surrounded by a gel- 

 atinous covering; laid in a single row along the edge of the 

 leaves of a sedge under water, and attached by one side [pl.21, 

 fig.2; pl.24, fig.3, 4]. 



Larva. Mandibles distinctly medially bidentate with well 

 marked teeth within [pl.26, tig.l] ; eyes present, five in number, 



