12 [April 



2.'.. Tenthredo semi-rufus. n. sp. 



Black, the apical half of abdomen rufous : wings hyaline. (Long 0.i(i. Br. 

 wings 0.92 in.) 



9 . Color black: antennae not longer than to 3rd segment of abdomen : joints 

 swelled at tips, the 3rd one-half longer than 4th ; head rugose, the furrows at 

 sides of and behind ocelli very distinct ; a cross suture on upj^er edge of head : 

 clypeus deeply notched, labrum produced, rounded at end : both of these, the 

 basal half of mandibles, collar and a dot above posterior eoxce, white: a spot 

 on the 4tli segment above and the five apical segments of abdomen rufou.-^: 

 legs black: the anterior ]iair Itelow the coxfe white before; the femora of 2nd 

 pair and the tibiee and tarsi of both the hinder pair reddish, becoming whiter 

 on the tarsi ; apical joint of all the tarsi pale, hinder spurs long, rather blunt: 

 wings slightly clouded: uervures, stigma and costa blackish. 



Var. a. Collar and 4th segment of abdomen wholly black : posterior femora 

 rufous before and the 1)asal half of posterior tibife also rufous above: the costa 

 in both pair of wings and some of the basal nerves reddish. 



Rocky Mountains, Col. Ter. (CoW. Ent. Soo. Philad.) Two specimens. 



21. Tenthredo var iegatus. n. sp. 



Black : the face, tegulse, collar, breast and legs beneath white, apical half of 

 abdomen rufous. (Long 0.36. Br. wings 0.76 in.) 



% . Color lilack : antennae not longer than to 2nd segment of abdomen : head 

 rugose, with distinct furrows at sides of ocelli : nasus and labrum as in the pre- 

 vious species: an oval dot above the base of each of antennae, a short line on 

 the summit of inner orbit, the cheeks, nasus and mouth beneath, tegnlae, collai'. 

 a longitudinal mark on pleura and a large spot on breast, before intermediate 

 legs, a spot above posterior coxse and all the legs Vjeneath, including the coxae, 

 white : abdomen mostly yellow- rufous, the 1st, 2nd and half of 3rd and 4th seg- 

 ments of tcrgum black: venter toward its base whitish; legs black above; apex 

 of coxaj white: tarsi all black, their patellas beneath white; apical half of 

 wings clouded, nervures black, basal half of stigma white, 2nd subniargiual 

 cell long and rather narrow. 3rd submarginal not longer than the width of its 

 outer end : 2n(l recurrent nei-vure received very near 2nd submarginal cross 

 iiervure. 



Rocky Motmtuins, Col. Tor. (Coll. Ent. Soc. Philarl.; One specimen. 



This may be a variety of 7\ pii-toralii<. 



2.3. Tenthredo variatus. n. sj). 



Blaclc: face, cheeks, tegulse. collar, line and spots on pleura and on breast, 

 white; abdomen rufous. {% 9 Long 0.4() to 0.48. Br. wings 0.8(5 to 0.92 in.) 



9. Color black: antennae as in jirevious species, ends of joints somewhat 

 globose: head enlarged Ijehiud the eyes and incurved bt'liind: sliining. having 

 confluent punctures, depressions about ocelli as in previous species: nasus and 

 labrum a<lvanced. the lattei- rathei- pointed: a minute dot at summit of orbits, 

 witbin, a sjiot above the base of each of antennte. the face below, cheeks, tegu- 

 l.-e. collar, with a round connected dot below, a longitudinal line on the pleura. 



