EEV. A. E, EATON ON RECENT EPHEMERID^ OR MAYFLIES. 113 



HAGENULUS, Etn., 1882. 

 Illustrations. — Adult (details). Plate XV. 21 bis. 



Adult. — Hind wing angulated in front very strongly indeed, almost midway between 

 the wing-roots and the tip ; the angle, acuminate (and in the typical species prolonged 

 more or less into a slender projection turned over sideways as a hook), precedes directly 

 a very deep sinus which extends far beyond the termination of the radius, and attains its 

 greatest depth in the interval between the subcosta (2) and the radius (3) at about f of 

 the shortest distance between the apex of the wing and the costa ; marginal area sub- 

 triangular, with the angle at the extremity of the subcosta obtuse ; submarginal area 

 narrower than the preceding, somewhat obcuneate, but not quite rectilinear, the subcosta 

 being strong and straight, the radius fine and subsinuous, and the margin between them 

 concave ; posterior to the radius two longitudinal nervures meet the margin, one a little 

 before the obtuse apex, the other at the apex of the wing ; cross veinlets limited almost 

 to a single dislocated series extending transversely from the extremity of the sub- 

 costa to the middle of the inner margin, the marginal area containing none. In the fore 

 wing cross veinlets are plentiful as far back as the second of the intercalaries in the anal- 

 axillar interspace, and some of them at the terminal margin constitute simple branchlets 

 to a few of the longitudinal nervures ; the intercalary nervures in the interspace men- 

 tioned are 2 in number and long ; the foremost (the longer) is prone to annex itself to 

 the first axillar. Forceps-limbs of d 3-jointed, with the proximal joint longer than the 

 remainder, compressed and broadly dilated towards the base. Forceps-basis entire ; the 

 homologous ventral lobe of ? bifid and acutely excised. An egg-valve of extraordinary 

 dimensions is produced from the apical border of segment 7, broad at the base, narrowed 

 ellipsoidally from thence to the middle, and terminating in a spout or a tube split open 

 along its upper side, resembling an ovipositor, projecting a little beyond the extremity of 

 segment 10. Caudal sette 3, subequal to one another, and in ? about twice as long as 

 the body. Tarsal ungues all dissimilar each to the other ; fore tarsus 6 subequal in 

 length to the tibia, which is more than twice as long as the femur ; its joints in diminish- 

 ing sequence rank 2, 3, 4 5, and 1. Fore tarsus $ less than \ as long as the tibia, which 

 is nearly 1^ as long as the femur ; hind tarsus $ (excluding joint 1) little more than \ as 

 long as the tibia and joint 1 (which is ill defined) together ; theii- joints rank 5, 2 subequal 

 to 3, 1 and 4<. Nymph unknown. 



Type. S. caligatiis, Hag. MS. 



Distribution. Cuba. 



Etymology. Dr. H. A. Hagen, the eminent neuropterist. 



Hagentjlus caligatus, Hag. MS. Plate XV. 21 bis (wings, legs, forceps, and penis). 



Hagenulus (in Potamanthus, Hag.) caligatus, ! Hag. MS., Etn. Ent. Mo. Mag. xviii. 207 (1882, Feb.). 



Subimago {dried), rf .—Wings transparent light bistre-grey ; neuration slightly opaque, 

 most of the discal cross veinlets of the fore wing faintly bordered with greyish, some in 

 the first three areas marked with black ; 7 cross veinlets in the marginal area before the 

 bulla. Setae annulated with black. 



