ls()4.] ]■] 



a s]>ot above the anterior and posterior coxte, another on the sides of basal 

 phites and a spot on breast before intermediate legs, white: abdomen rufous 

 with 1st. 2nd and 3rd segments above and beneath and the apex beneath black : 

 legs black, red and white ; all the coxae (except a black spot above), trochan- 

 ters and anterior legs before and all the patellsB, white, anterior pair above and 

 both the posterior pair more or less rufous, with a slender black line down all 

 the femora and the four anterior tibiae ; apical half of wings smoky, nervures 

 black, stigma pale at base, costa reddish. 



9 . Labrum not pointed, but rounded before : a slender white orbital line on 

 tlie inner half of orbit : all of pleura, exeejit a prolonged triangle beneath the 

 wings and the breast, white: the femora whitish beneath. 



Rocky Mounttiiiis, Col.Ter. (Coll. Eiit. 8oc. Philad.) Two specimens. 



!''>. Tenthredo xanthus. n. sp. 



Honey yellow ; face, tegulpe. collar and a spot above posterior legs white; 

 front of prothorax and a spot on breast, black. (Long 0.52. Br. wings 0.96 in.) 



9 . Brownish honey yellow ; antennse not longer than to 2nd segment of ab- 

 domen, somewhat flattened. 1st joint stout, 2nd more slender, not half as long: 

 the two basal joints and part of third beneath rufous, the remainder black : 

 head as wide as thorax, thick, widened behind the eyes, furrows at sides of 

 ocelli deejj and narrow, enclosure behind square, nasus deeply incurved, labrum 

 produced and rounded at end: head with indistinct confluent punctures; an 

 obsolete line on inner orbits and a spot above each of antennse, the face below, 

 cheeks, tegulse, collar with a connected dot beneath, the outer edge of basal 

 j)lates and a spot above posterior coxse white or pale straw color: the prothorax, 

 the front of anterior lobe and a dot at base of sides of side lobes of niesothorax, 

 breast, a narrow line iu the sutures of the 2nd, .Srd. 4th and 6th segment and 

 part of the apex beneath, black: legs the color of body, their anterior coxt-e 

 and the two anterior pair before, pale: inner spur on anterior tibife two-thirds 

 as long as first joint of tarsi, sharp and widely bifid: hinder legs long and 

 stout: wings smoky, nervures blackish, costa and basal nervures i-ufous: base 

 of stigma pale. 



Var. a. A triangular white spot on pleura. 



Var. b. The antennse whitish beneath. 



Pike's Peak. Col. Ter. (Coll. Eiit. Soc. Philad.) Twenty-two speci- 

 mens examined. 



This bears a close resemblance to 7\ tne/lun(^ of Maine and the 

 White Motintains. 



27. Tenthredo angulatus, n. sp. 



Black, witli the orbits, face below antonnfe. collar. V spot on thorax, an angu- 

 lar line and spots on jjleura and the breast white: apical half of abdomen ru- 

 fous. (Long 0.32. Br. wings 0.70 in.) 



% . Shining black : antenn;ie very long, enlarged and flattened in middle. or<l 

 j(jint a little longer than ith: head polished, ;in oi'liital line interrupted at sum- 



