THE CANADIAN ENTOMOLOGIST. 393 



separated. In this position they were divergent at an angle of 

 about 35°. The laterally situated apices occupied a position 

 adjacent to the inner surface of the base of the cardo, or first joint 

 of the maxilla (fig. 1, inx.). 



When the exact position of the prothorax in relation to the 

 head is observed, it will be seen that the posterior margin of the 

 pronotum approximately coincides with the position of the hook- 

 like processes rising from the upper side of the male superior 

 appendages, and there seems little reason to doubt that in copula- 

 tion these processes hook over the pronotal margin as shown in 

 figs. 1 and 2. The expanded part of the appendages enclose the 

 pronotum, the crest-like elevations of the superior carinae, which 

 are directed inward, passing beneath and completing the pair of 

 claspers. They appear to fit in a deep depression on the side of the 

 pro-epimerum. 



Thus the grasp of the male appendages as compared with those 

 of .'Eshna, etc., is complicated and strengthened by the following 

 specializations of structure: 



(a) The basal protuberance of the inferior appendages, serving 

 to support the occipital region of the head. 



(b) The hook-like processes of the lateral margins, supporting 

 the hind margin of the pronotum. 



(c) The unusual development of the subapical denticulate 

 crest, serving to grasp the neck immediately in front of the pronotum. 



Notes by E. B. Williamson. 

 The first Staurophlehia I ever saw came sailing along the 

 railroad track below Los Amates, Guatemala, one sunshiny morn- 

 ing (June 21, 1909) after a heavy night's rain. As he came towards 

 me, I saw him at some distance, a gigantic fellow flying now within 

 a few feet of the ground and now high up in the air, but following 

 the lane or slash made by the railroad through the jungle. As he 

 raised to pass me, the impression was of a dull, dark insect which 

 might be brown or obscure blue or green. To our mutual surprise 

 a despairing, straight backward high-reached sweep of the net 

 overtook him. This was the only specimen I saw in Guatemala 

 during two collecting trips. 



