H. C. FALL 465 



The abundant and widespread bivittatus of Say has long passed 

 as viduafus Fab., but the error has recently been pointed out by 

 Bowditch. Albescens Suffr. is then a synonym of bivittatus, as 

 an examination of the type shows. The true viduaius is not at 

 all closely allied to bivittatus, the only similarity being the vittate 

 elytra; it is, however, cjuite closely related in most of its charac- 

 ters to pulvinatus and trinotatus. 

 146. Pachybrachys m-nigrum Mclshcimer 



Yellow with the standard markings black and so heavy or 

 broadly confluent that the prothorax may best be described as 

 black with two elongate basal spots, a narrowly oval median 

 anterior spot, the side margins — broader at front angles — and the 

 extreme apical edge, yellow; elytra black with the apex, two 

 lateral transverse or subquadrate spots, the basal margin, an 

 intrahumeral basal spot, a small basal spot near the suture, some- 

 times free, sometimes connected with the basal margin, and a 

 median spot involving the shield, yellow. Eyes distant, front 

 without distinct ocular lines; front claws scarcely at all enlarged. 

 Ave. length 3.6 mm. Eastern United States. 



Head not wider than the thoracic apex, closely not coarsely punctate, mark- 

 ings heavy; eyes separated by an average of about two and three-fourths times 

 the length of the basal antennal joint, the disparity in the sexes in this respect 

 scarcely noticeable. Antennae slender, differing but slightly in the sexes, in 

 great part black, about four-fifths as long as the body, the tenth joint linear, 

 four and one-half or five times as long as wide. 



Prothorax moderately closely, nearly evenly, not very coarsely punctate, 

 side margins smoother, the M heavily marked and fairly constant. 



Elytral punctures coarser, confused in baso-sutural region, striae close, feebly 

 impressed, variable in distinctness, fairly well defined — though sinuous — on 

 the rear convexity and at the sides; marginal interspace subimpunctate to 

 moderately numerously punctate; shield rounded, distinct. The inner stand- 

 ard spots are more or less completely confluent with each other longitudinally 

 and across the suture and with the corresponding spots of the outer series 

 leaving yellow spots as described in the above diagnosis, and sometimes also 

 some scattered smaller ones along the suture. 



Pygidium black with yellow apical spots. Bodj' beneath black, last ventral 

 with a small lateral yellow spot. Legs black and yellow, the femora black in 

 the basal, the tibiae in the distal half. 



Length 3.2.5 to 3.9 mm.; width 1.7.5 to 2.25 mm. 



Distribution. — Neiv Hampshire: Franconia (Mrs. A. T. Slosson); "N. H." 

 (Nat. Mus. Coll.). Massachusetts: Tyngsboro, July 3 to Aug. 31, Dracut and 

 Lowell (Blanchard); "Mass." (Mat. Mus. Coll.). New York: Peekskill 

 (Leng); N. Y. City (Soltau); White Lake, July (Zabriskie— Nat . Mus. Coll.); 



TRANS. AM. ENT. SOC, XLI. 



