302 THE CANADIAN ENTOMOLOGIST. 



4. Nadabius iowensis (Meinert). 



A species very common in the Middle West. About a dozen 

 specimens. 



5. Sonibius bius (Chamberlin). 



Previously known from Saunders in the upper peninsula. 

 Two specimens. 



6. Nampabius michiganensis, sp. nov. 



Dorsum from light brownish yellow to brown of dilute chestnut 

 caste, the caudal plates commonly darkest Head darker, more 

 distinctly chestnut. Antennae like head; the colour becoming 

 denser and more reddish distad. Presternum and prehensors 

 somewhat lighter than head, but decidedly darker than venter, 

 which is yellow or brownish yellow and darker caudad or usual. 

 Caudal legs darkest. 



Body conspicuously narrowed cephalad from eighth plate. 

 Widths of head and of first, third eighth, tenth and twelfth plates 

 to each other as 47: 41 : 45: 56: 55+ ; 54. 



Head slightly wider than long (47:45) comparatively rather 

 wide cephalad. Caudal margin mesally incurved. Two short 

 longitudinal furrows on caudal portion, these moderately diverging 

 cephalad. 



Antennae short, but somewhat longer than in most related 

 species. Uniformly and considerably attenuated distad, the 

 terminal portion slender. Articles freely joined; sides straight; 

 short, decreasing regularly from the second distad. Ultimate 

 article distinctly shorter than the two preceding together. 



Ocelli mostly 10 to 12 in 3, or, less commonly, in 4 series; e.g., 

 1+4,4, 2; 1+4,4,3; 1 + 1, 4, 3, 2, the ocellus of the top row in this 

 case being at anterior end of patch. Single ocellus much largest, 

 the others decreasing regularly and considerably cephalad. Organ 

 of Tornosvary in outline small; below anterior end of eye patch. 



Prosternal teeth acute, subequal, sides straight, the interval 

 well rounded; line of apices recurved. Sinus wide at bottom as 

 usual; its sides rather long, moderately converging. Sides of 

 anterior portion of presternum straight or nearly so, slanting 

 directly from spine, 1.47 times wider than long in type. Distance 

 between chitinous spots 2.57 times width at level of bottom of 

 sinus, 4 times the dental line. 



