NO. 3568 MELANOTUS — QUATE AND THOMPSON 53 



Melanotus americanus. — Candfeze, 1860, p. 361. — Blatchlcy, 1!)10, p. 747. — 



Fattig, 1951, p. 21. 

 Cralonychus anguslaius Erichson, 1842, p. 113. — LeConte, 1853, p. 475. [New 



synonymy.] 

 Melanotus angustaliis. — Candeze, 1860, p. 345. — Blatcliley, 1910, p. 753. — Thomas, 



1941, p. 258. 



Male. — Body color reddish bro^^^l, covered ^\^th white vestiture 

 evenly distributed over body. Small species. 



Head: Front \\dth pair of shallow, anterolateral, or single, curved 

 anterior depressions, margm dark reddish brown, protuberant above 

 clypeus, a little angulate or flat across center when viewed from 

 above; parantennal fovea large, semicircular, moderately deep, with 

 weak foveal tragus; nasale usually as wide as high, w^ell developed. 

 Mandible with deep, teardrop-shaped pit. Antenna exceeds tip of 

 hind angle by 1^2-2 segments; segment 3 short but intermediate 

 between 2 and 4, ratio of segments 2:3:4=2:3:5, segment 4 about 

 1% times as long as maximum width; erect male hairs long and 

 conspicuous. 



Pronotum usually wider than long, ratio of width/length = 1 .00-1 .17, 

 rounded in appearance when viewed from side; punctures small at 

 center and usually separated by distance equal to twice own diameter; 

 sides of pronotum rounded anteriorly and almost parallel behind. 

 Genitalia as figured; paramere enlarged apicaUy, but without apical 

 blade. 



Elytron: 5.4 ±0.4 mm (4.5-6.3). 50 spec. 



Female. — Antenna extends to tip of hind angle or exceeds it by 

 about one-half segment; genitalia as figured, numerous spines in 

 anterior half, spines long and without flat bases, pouchlike swelling 

 at base of accessory gland, gland short and expanded beyond base, 

 diverticidum branching from spermathecal duct near center of duct. 



Elytron: 5.7i0.3 mm (4.8-6.7). 93 spec. 



Types. — Lectotype of americanus: Male, "America Sept." (ZM). 

 Selected by Quate, 1960. Seven other males in type series. 



Lectotype of angustatus: Female, "Pennsylvania" (ZM 17057). 

 Selected by Quate, 1960; 4 other females in type series. 



Distribution. — Eastern U.S. west to Indiana and Illinois. 



Connecticut: Hartford, Litchfield; June. Delaware: Sussex; I\Iay. 

 Georgia: DeKalb, Fulton, Rabun; INIay, June. Illinois: McHenry, Putnam, 

 Rock Is.; June, July. Indiana: Marion; July. Maryland: Anne Arundel, 

 Baltimore, Frederick, Plummers Is.; June, July. Massachusetts: Barn- 

 stable, Hampshire, JNIiddlesex; June, September. Nebraska: Cass; May, 

 July. New Jersey: Bei'gen, Middlesex, Morris, Union; June, July. New 

 York: Putnam, Suffolk, Westchester; April, August. North Carolina: Bun- 

 combe, Cherokee, Cumberland, Moore, Montgomery, Pender, Pickens, Swain, 

 Wake; April, July. Ohio: Delaware, Fairfield, Franklin, Greene, Hocking; 

 May, June. Pennsylvania: Allegheny, Dauphin, Northampton, Perry; June, 

 221-532— 67-— 5 



