L8 CHE 1 M MA II BE 51 \ I I. OF CHE ODONATA. 



Bead very large and somewhat out of shape, being in process of trans- 

 formation; eyes nipple-shaped, produced laterally and projecting backward; 

 pyramidal horn sharp, longer than the basal joints of the antennae, covered 

 with stiff bristles, which are thickened at tip; antenna 1 shorter and thin- 

 ner than in M. [llinoiensis, 4th joint shorter than oA ; head flat above, sides 

 straight, converging; at each side, on the hind angle, a small pointed tuber- 

 cle : mask with very faint Mack dots, basal part equilateral ; abdomen similar 

 to M. Illinoiensis, 10th segment a little longer, perhaps owing to the process 

 of transformation, half as long as 9th, yellow ; dorsal hooks also similar, an 

 indication on 10th; long and sharp on 6th to 9th, more hook-shaped on 

 the foregoing segments; lateral spines short, straight, sharp, on 9th about 

 as long as segment 10; on 8th shorter; anal appendages stout, short, dorsal 

 median as long as the inferiors, laterals a little shorter, sharper at tip; legs 

 a little longer, ringed with black. 



The type of Walsh was collected at the same locality with the imago, 

 and was believed by him to belong to Gomphus spinosus. The imago type 

 was burned in the Chicago fire ; no second specimen is known. It was 

 examined by Dr. Hagen in 1868, and it was found that a clerical error in 

 the Translation of the Latin description had prevented the identification with 

 M. annulata. This species has a large yellow band on each side of the dorsum 

 of the thorax, and unusually long light-colored hairs. The dorsum of the 

 imago, ready to emerge from the nympha just described, shows exactly the 

 same character. 



5. MACROMIA MAG-NIFICA. (Supposition.) 



Plate II. Fig. 2. 



Imago. Macromia magnitica McLachl. (in litteris). Selys, Syn. Cordul., Add. II., 70 bis. 



A male nympha skin from Umatilla, Oregon, June 25, 1882, from Mr. S. 

 Henshaw. Length, 31 mm.; breadth, 11 mm. 



Head large, broad, 8 mm. ; eyes produced laterally and a little backward 

 in blunt short cones ; pyramidal horn short, broad, its tip rounded and very 

 hairy ; antennae similar to M. Illinoiensis, a little longer and thicker, joint 4 

 shorter than 3 ; sides of head more convergent, less produced, with a blunt 

 point below near the mask ; hind angles have rounded tubercles; basal part 

 of the mask shorter than broad; wing cases reaching 6th segment; abdo- 



