72 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Maxillary stridulatory area with an irregular row of 15 conical 

 teeth facing cephalad; small toothlike markmgs behind the plectrum 

 and on cardo. Galea ventrally with a long seta and a row of four 

 short setae. 



Abdominal segments 1-6 each with three dorsal annulets; each 

 annulet with a transverse row of setae except the last annulet of 

 segment 6. On the annulets of segments 1-5 each prescutum with 

 six short setae, each scutum with three long setae and three short setae 

 on each side, and each scutellum with 10 short setae. Segments 7 

 and 8 each with two dorsal annulets and each annulet with a trans- 

 verse row of setae; segments 9 and 10 each with two transverse rows 

 of closely placed setae but dorsa not divided. 



Raster with teges of 41 hamate setae scattered irregularly on the 

 venter of 10th abdominal segment, three or four long setae on each 

 side. Lower anal lobe divided into two adjacent sublobes. 



Ataenius sp. 2 {strigntus group) 



Material examined: One third-stage larva collected in soil at 

 Lamont, Wis., Aug. 16, 1940, by Seaton (reared adults determined 

 by E. A. Chapin) (USNM). [The reared adults were determined as 

 A. falli Hinton, a synonym of A. spretulus (Haldeman). A soil- 

 collected larva might have been either this species or A. strigatus 

 (Say).] 



Description: Maximum width of head capsule of thu-d-stage 

 larva 1.22 mm. Cranium light yellow, surface smooth. Three 

 dorsoepicranial setae and two microsensillae on each side. Frontal 

 sutures distinct. Clypeus marked into smaller preclypeus and large 

 postclypeus. 



Epipharynx with protophoba bistichous on left and monostichous 

 on right; protophoba with 16 microsensillae; mesophoba polystichous. 

 Crepide small and subcircular; epitorma asymmetrical, flattened 

 apically and bent towards laeophoba. 



Mandibles yellowish brown with scissorial and molar area reddish 

 brown. Each mandible dorsally with one long seta and one short 

 seta, ventrally without setae. Brustia well developed on left man- 

 dible, but not so developed on right mandible. 



Maxillary stridulatory area with a row of 10 or 11 blunt teeth, 

 facing cephalad; small toothlike markings behind the plectrum and 

 on cardo. Galea ventrally with one long seta and a row of four short 

 setae. 



Abdominal segments 1-8 each with three dorsal annulets; each 

 annulet with a transverse row of setae except the last annulet of 

 segments 6-8. On the annulets of segments 1-5 each prescutum with 

 six short setae, each scutiun with three long setae and three short 



