2 University of Michigan 



Archaeogomphus furcatus, new species 



,\ljdomen, male 24, female 24; hind wing, male 18.5, female 

 19-20. 



Male. — Like A. hamatus except as noted below. Labrtim 

 with only a trace of a diffuse median brown spot; frons above 

 slightly brownish, no defined triangular median spot; occiput 

 rounded off posteriorly as in hamatus, and at either end a 

 small, scarcely discernible knob where the horns of the female 

 occur. 



Abdominal segment 2 slightly darker above than laterally, 

 except at base, but no distinctly defined areas except the pos- 

 terior black edge on the auricle; posterior suture black or 

 nearly so (brown in hamatus) ; 3 as in hamatus, but with the 

 apical brown not e^^dent; likewise on 4-6 the apical dark is 

 evident only as an ill-defined darkening on each segment, suc- 

 cessively darker posteriorly and occupying about one-third of 

 6; the dark ring in the basal pale area of each of segments 4-6 

 is narrow as in 3, and much narrower than in hamatus. 



Second and third femora brown above, little if any darker 

 at apex; tarsi brown, marked yellow as described for hamatus. 

 (A re-examination of Jiamatus shows that in at least one case 

 the tarsi are largely yellow, only the joints and the apex of 

 the 'last segment being brown or black.) 



Second hamule with the apical hook slightly more recurved 

 than in hamatus and, the ventral border of the hamule, anterior 

 to the hook, slightly elevated and rounded; not as straight as 

 in hamatus. 



The above description is based on a single male of furcatus. 

 The body colors of these gomphines are in general not in sharp 

 contrast and postmortem changes operate still farther to oblit- 

 erate the obscure pattern lines ; so color differences between 



