440 AMERICAN PACHYBBACHYS (cOLEOPTERA) 



fascia may be interrupted within the humeral knob and the posterior band is 

 often more or less deeply emarginate anteriorly. In the more heavily marked 

 specimens the elytra may be defined as black, with the apex and a some- 

 what oblique ante-median fascia interrupted at suture, yellow; marginal in- 

 terspace nearly or quite impunctate. 



Pygidium black with the usual yellow apical spots. Body beneath black, 

 sides of abdomen and last segment more or less yellow. Legs yellow, the fem- 

 ora sometimes with small faint median clouds. 



Length 2.2 to 3.2 mm.; width 1.2 to 1.75 mm. 



Distribution. — Connecticut: (Leng). New York: Staten Island, June and 

 July (Leng); Long Island (Nat. Mus. Coll.); Ft. Lee, June 18 (Van Dyke Coll.); 

 "N. Y." (Am. Ent. Soc. Coll.). New Jersey: (Nat. Mus. Coll.); So. Orange, 

 June 8 (Leng); Cairo, July 23 (Leng); West Hebron, June 20 (Leng); Anglesea 

 (Wenzel). Pennsylvania: (Horn Coll.), (Liebeck); Frankford (Wenzel); 

 Eberly's Mill (vsly. flavicornis) (Kirk and Champlain). District of Columbia: 

 Washington, May 20 to June 25 (Hubbard & Schwarz). Virginia: without 

 specific locahty. Michigan: Detroit, June (Hubbard & Schwarz). Indiana: 

 (Liebeck CoU.). Illinois: (LeConte Coll.); "S. 111." May 27 (Soltau in Nat. 

 Mus. Coll.). Iowa: Iowa City, May 30 (Wickham). Missouri: (LeConte 

 Coll.). Kentucky: (Soltau — Nat. Mus. Coll.). Kansas: Douglas Co. (Snow). 

 Texas: (Nat. Mus. Coll.). 



This prettily marked species is rather widely dispersed and 

 quite familiar to most collectors. The ground color in some 

 examples is very pale whitish yellow, contrasting strongly with the 

 black markings ; the ocular lines are a httle variable in depth but 

 as a rule are quite fine and feebly impressed; the antennae are 

 entirely yellow, a very unusual character. 



Var. flavicornis Melshcimer 



This is tridens with the thoracic markings broad and connected 

 so as to leave two basal spots, the side margins and front angles 

 j^ellow; the elytral fasciae are also heavier than usual, leaving the 

 apex and an obliquely transverse rather narrow yellow fascia not 

 attaining the suture. The interval between this form and the 

 typical tridens is not great and is completely occupied by inter- 

 mediates. 

 121. Pachybrachys obsoletus Suffrian 



Very similar to tridens m form, size and at! other characters 

 except as follows. The thoracic spots are as a rule not (piite so 

 regular and sharply outlined, the broad elytral markings of tri- 

 dens are here broken up so as to show the standard s])ots, which 

 are, however, often more or less connected posteriorly, the sutural 

 inters])ace almost invariably wholly or in great inirt ])al(\ The 



