258 FAMILY VI. — HYDEOPHILID.E. 



gg. Mesosternum with a compressed conical process; tarsal claws 

 broadlj^ toothed at base iu male, less so in female; elytra 

 striate. XIV. Helocombus. 



dd. Last .idint of maxillary palpi hmgor than the third. 



/(. I'^lytra either with stri;e or with punctures arranged in rows ; 



larger species, more than 5 mm. XV. Hydrobii s. 



////. Elytra with confused punctuation; smaller species, less than 



4 mm. XVI. Creniphilus. 



VIII. Berosus Leach. 1817. (Gr., a proper name.) 



This genus is composed of convex, elongate beetles, usually pale 

 in color with darker spots on thorax and elytra. They may be 

 known also by the 7-jointed antenna?, elongate scutellum and the 

 hind pair of tibiaj and tarsi pilose. Three species are knoAvn from 

 Indiana., while two others probably occur. 



KEY TO INDIANA SPECIES OF BEROSLS. 



«. Elytra with two spines at apex; hfth abdominal segment truncate at 

 middle. pugnax. 



ua. Elytra without spines at apex. 



h. Filth segment of abdomen with one tooth at middle of notch. 

 c. Abdomen of male with segments 2, o and 4 slightly cariuate. 



d. Elytra with well defined black spots. 498. pantherinus. 



dd. Elytra with spots indistinct. 499. peregrinus. 



cc. Abdomen of male not carinate ; l)ntli head and abdomen dull yel- 

 low. EXIGUUS. 



hh. Fifth segment of abdomen with two teeth at middle of notch; ab- 

 domen never carinate; elyti-al spots indistinct. 500. striatus. 



498 (1G08). Berosus pantherinus Lee. Proc. Phil. Acad. Nat. Sci., VI. 



1855, 3G4. 

 Elongate-oval, convex. Pale, dull yellow ; head blackish-bronzed ; thorax 

 with two black spots at middle; elytra each with ten distinct black spots 

 as follows ; two near base, four in a sinuous transverse band in front of 

 middle, three in another band behind middle, and one near apex; abdomen 

 reddish-brown. Thorax finely punctured, the sides slightly converging in 

 front. Elytral stri;e coarsely punctured ; intervals rather thicklj' and irregu- 

 larly punctate. Length 4 nun. 



Posey County; rare. June 3. Known from Illinois, IMissouri 

 and Texas. 



499 (1609). P.EUOSUS PKiiwaiiM s Ilerhst.. CuL. VII, :J14. 



Oval, convex. Ilend black with bronzed surface; thorax and elytra 

 light l)i'()wiiisli-yellow. ilic loi'incr with two brown spots un disk, the latter 

 witli f<inr or live iudisliiict oblong, double spots. Elytral striae less dis- 

 tinct on disk than on sides, the intervals linely punctured. Head thickly 

 punctured, with a longitudinal impression between the eyes. Length 4 mm. 



1 lir(;ugh(iu1 the State; frequent. .lune 6-August 20. 



