264 EDWARD NORTON. 



polished, the space above ocelli punctured; thorax dull, with dense 

 punctures; nasus deeply emarginate, mandibles very wide and stron<>;, 

 mostly white, apex black ; nasus, labrum, collar, (tei;ula3 black) scutel, 

 a spot above each of the four hinder coxas, and a band covering the 

 third and fourth segments of abdomen, yellow, (on the abdomen tinged 

 with orange); legs black at base, the anterior femora before, the upper 

 half of intermediate femora and the parts beneath, yellowish ; tips of 

 posterior tibire black ; wings smoky yellowish, stigma, costa and basal 

 iiervures black. 



Washington Territory, (Baron Osten Sacken). 



One 9 . The abdomen is very long and stout, making this much 

 larger than any other of our species. 



7. A. unicinctus. 



AUantus unicinctus, Norton, Proc. Ent. Soc. Phil, iii, 1864, 9 17, 9 'J,. 

 Black: a wide annulus on antennse, mouth, collar, scutel, third and fourth 

 segments of abdomen and lower half of legs white. Length 0.47. Br. wings 

 0.92 inch. 



9. 33ody long, cylindrical; antennse not as long as thorax, third 

 joint nearly as long as fourth and fifth, color black, the fourth to the 

 eighth inclusive, white, apical joint brownish; head rugose; clypeus 

 notched, labrum conic; both, with the base of mandibles, a wide mark 

 on collar, upper half of scutel, a spot on each side of basal plates and 

 an adjacent spot at base of posterior coxae, the third and fourth seg- 

 ments of abdomen pale straw-yellow ; thorax dull, with fine, separated 

 punctures; legs black above the knee joints, the whole apical half of 

 anterior femora, apical half of medial femora above and the tibise and 

 tarsi pale yellow ; the tips of posterior tibijB blackish ; tips of the four 

 anterior tibiae, and all the tarsi reddish. Wings clouded, apical half 

 darkest, nervures black, stigma and costa brown. 



% . The male has the fourth and fifth joints of antennae black above, 

 spot on collar small, the sides of first and second and all of the third 

 segments of abdomen, except a spot on its apex above, yellowish. 



Kocky Mts., Colorado, ((Coll. Am. Ent. Soc.) Three 9 , three % . 



Species not determined. 



S. A. ohesus. 



Allanlus obefius, Say, Harris' Cat. 



Norton, Bost. Jour, vii, 1860, 260, %. 



Black: body stout; wings fasci ate. Length about 0.. 35 Br. wings 0.71 incli. 



%. Shining black; thorax wide; abdomen short and stout; head 



narrower than thorax, coarsely punctured ; vertex surrounded by an 



(jval ridge, inclosing the anterior ocellus; antcnnie moderate, third 



