Till' WATICK SC'AVRXdRR liEKTrjCS. 251 



■iSO (1550). IIelophoeiis lineatus Say, Journ. Phil. Acad. Nat. Sci., III. 

 200 ; ibid. II, 128. 

 Elongate-obliiui,', Ab(]-\-e light brown with a greenish 

 tinge; elytra often with fiiser.iis markings, of which an 

 inverted A' on snture behind middle and two spots each 

 side are most olivions; antennas and legs pale. Inter- 

 mediate snlci of thora.x, deep, narrow, very strongly 

 curved or subangulate near middle. Elytral stri;e with 

 deep, dilated transverse punctures. Length 2.8-.3.5 mm. 

 (Fig. 124.) 



Throughout the State; frequent. April 11-Oc- ''^-^^^i x lo 



tober 17. (Original.) 



4S1 (l.'ii^c). Helophoeus linearis Lee, Proc. Phil. Acad. Nat. Sci., 1S55, 



Elongate, slender. Dull brownish-yellow ; head and thorax tinged with 

 greenish ; el.vtra clouded with fuscous. Thorax one-half wider than long, 

 granulate; intermediate sulci feebly sinuate. Length 3 mm. 



]\lillers, Lake County; rare. Jlav 2r>. Recorded from Buffalo, 

 New York, Nebraska and Canada. 

 482 (1553). Helophorus tuberoulatus Gyll., Ins. Suec, 1827. 



Elongate, convex. Dull black, tinged with greenish. Tliird elytral in- 

 terval with four elevations, the basal one oblong; fifth and seventh each 

 with three. Length 3.5 mm. 



Beneath rubbish close to water on beach of Lake Michigan, near 

 Pine and Millers, Lake County; scarce. April 23-June 24. 



II. Hydrochi'S Leach. 1817. (Gr., "relating to water.") 



Thorax much narrower than elytra, its breadth being equal to or 

 (!nly slightly exceeding the length; disk usually marked with small 

 cups or fovea'. The following species have been taken or may oc- 

 cur in the State. 



KEY TO I.\niANA SPECIES OF HYDROCHUS. 



CI. Larger. 5.'> mm. ; elytra with intervals flat and much wider than striie. 

 the fourth with hu-^xe oblique tubercles. scabratus. 



(la. Smaller, not over 4.5 mm.; intervals convex. 



b. Thorax with tive more or less disthi(;t foveie or cup-shaped impres- 

 sions, 

 c. Strin> of elytra as wide as or wider than intervals; thorax with 

 granules between the punctures. 

 (1. Sides of thorax distinctly sinuate near base, not crenulate ; 

 length ;!.s-4 mm. i^-''- squamifkr. 



ihl. Sides of thorax finely crenulate. 



f. Smaller, not over .'I mm.; sides of thorax subsinuate. 



484. IN^ISQIALIS. 



