•h-I: [December 



and sometimes slightly, sometimes deeply emarginate or indented on 

 each side of the anterior middle, sometimes the band, although inter- 

 rupted in the middle, is broad, not indented, but has a small black spot 

 on each side of the interruption ; the band on the second segment is 

 sometimes interrupted by the emargination on each side cutting through, 

 as in the typical % specimen, sometimes there is an oblique indentation 

 on each side of the middle anteriorly; the other bands are similar to 

 those in the typical specimens ; the two spots on the apical segment 

 vary much in size, they are mostly large and sometimes confluent and 

 forming a broad band, more or less contracted in the middle ; the ven- 

 tral segments have the bands sometimes continuous, but generally more 

 or less indented and often interrupted into spots, the apical segment 

 has sometimes two large unequal spots, occasionally confluent. The 

 transverse yellow line at the base of the clypeus varies much in size, 

 l)eing sometimes quite large, sometimes interrupted and reduced to two 

 small dots and sometimes entirely obsolete. The anterior yellow margin 

 of the prothorax is sometimes slightly interrupted on each side of the 

 middle, more or less broad, and sometimes acutely produced posteriorly 

 on each side of the mesothorax, and in one specimen the prothorax is 

 divided on each side from the mesothorax by a narrow yellow line ex- 

 tending to the tegulae, and in another specimen there are two elongate 

 approximate yellow spots or lines on the disk of the posterior part of 

 the mesothorax. The scutellum generally has a small bilabed spot at 

 tip, but in some specimens this spot is very large and sublunate, in 

 others there is a mere transverse line, while in others it is entirely obli- 

 terated. The spot on the pleura, just beneath the anterior wing, varies 

 much in size, being in some specimens very large, in others reduced to 

 a mere dot, and occasionally wanting. 



The specimens do not vary much in size from the typical specimens, 

 except one % . which is about one-third less than the other males. 



This handsome species was collected by Mr. Ridings in the month of 

 August, on a plant allied to the genus Lobelia, growing abundantly at 

 the roadsides in the vicinity of Empire City, Colorado Territory. 



Thirty-eight $ and four % specimens examined. (Coll. Ent. Sjc. 

 Philad.) 



Masaris zonalis, n. sp. 



Female. — Opaque black ; head and thorax clothed with short black 



