260 THE CANADIAN ENTOMOLOGIST 



apical spot in the ventro-apical angle of the segment. Segs. 8 

 and 9 with more or less black on the lower sides. 



Some males show antero-lateral spots on segs. 4-6. 



The specimens from Arizona have less black on the head and 

 thorax. In Dr. Calvert's specimen the humeral stripe shows no 

 trace of a fork. In the male from the Santa Rita Mts. the humeral 

 stripe is forked and almost as heavy as in the Fillmore and Santa 

 Barbara specimens. The specimens from the Huachuca Mts. have 

 humeral stripes from the narrow form in the Dr. Calvert male to 

 those in which a fork is suggested by a more or less perfect branch, 

 but in all cases narrow. 



Appendages: superior appendage cupped on the ventral sur- 

 face, with a tooth on the ental edge, which turns under the ap- 

 pendage thus being directed ectad; and a blunt, black subapical 

 ventral tubercle. Inferior appendage bifid, the lower lobe rounded 

 or triangular, the upper directed caudad and bearing a small 

 tooth on its upper edge. 



Female coloured brown with the black markings on the head 

 and thorax as in the male. Eyes in life brownish violet. The 

 abdomen with lateral stripes on segs. 2-9, those on segs. 7 and 8 

 more or less confluent with their mates along the mid-dorsal line. 

 Segs. 2-8 with a latero-apical oblique spot on the lower apical 

 angle of the side. Segs. 2-7 with a narrow apical ring. 



The female mesostigmal laminae have each a small posterior, 

 free lobe. 



Explanation of Plate V. 



Figs. 1-4. Holotype of Argia solita. Fig. 1 colour pattern, figs. 



2-4 appendages. 

 Figs. 5-10. Types of Argia alberta. Fig. 5 colour pattern of 



male, fig. 6 of abdomen of female; fig. 7 mesostigmal lamina 



of female. Figs. 8-10 male appendages. 

 Figs. 11-16. Types of Argia hinei. Fig. 11 colour pattern of 



male, fig. 12 of abdomen of female; fig. 13 mesostigmal lamina 



of female. Figs. 14-16 appendages of male. 

 Figs. 17-22. Pale Argia hinei from Arizona. Figs. 17, 20-22 the 



male labeled solita by Hagen and now in Dr. Calvert's coll. 

 Figs. 18-19. Female from the Huachuca Mts. 



