Sept., I9I2.] Matheson : Haliplid^ of North America, 163 



E. Disc of pronotum without a transverse depression ; elytral 



punctures deep and prominent cribrarius Leconte. 



EE. Disc of pronotum with a prominent transverse depression ; 

 elytral punctures shallow ; species smaller, paler colored. 



nitens Leconte. 

 CC. Prosternum distinctly margined. 



F. Metasternum with a deep square impression. ./;(j;nt//(.f Leconte. 

 FF. Metasternum without such a deep, square impression. 

 G. Species entirely rufous, without black markings. 



H. Species small, not exceeding 2.5 mm. ; no definite rows 



of interstitial ptmctures on elytra., .cone ol or Leconte. 



HH. Species larger, 3.5-4 mm. ; interval with definite rows 



of small punctures mimetictis, n. sp. 



GG. Species not entirely rufous ; black markings always present. 

 /. Species small, not exceeding 3 mm. 



/. Apices of elytra strongly sinuate, .borealis Leconte. 

 //. Apices of elytra not strongly sinuate. 



K. Pronotum with a small rounded rufous spot on 

 anterior margin ; elytra with prominent black 

 markings, their apices obliquely truncate. 



deceptus. n. sp. 

 KK. Pronotum immaculate ; markings on elytra in- 

 distinct and more or less confluent; apices of 



elytra rounded lezvisli Crotch. 



//. Species larger, none shorter than 3.5 mm. 



L. Anterior margin of pronotum with a large, oval, 

 black spot. 



M. Species bright rufous with black markings ; disc 

 of pronotum punctate ; apices of elytra rounded ; 



species larger, 4-4.5 mm punctatus Aube. 



MM. Species never bright rufous, pale yellow with 

 black markings ; disc of pronotum smooth ; 

 apices of elytra very obliquely truncate; 



species smaller, 3.5 mm triopsis Say. 



LL. Pronotum immaculate. 



A^. Prothorax broad : elytral spots large, usually 

 not connected ; sutural stripe broad, the por- 

 tion in front of the median spot always ex- 

 tending to the first row of large punctures ; 

 apices of elytra not denticulate. 



fasciatus Aube. 



A^A''. Prothorax narrow ; elytral spots smaller, nearly 



always connected by fine black lines ; sutural 



stripe narrow, never reaching the first row of 



large punctures ; apices of elytra denticulate. 



connexiis, n. sp. 



