'lil H. A. HAGEN. 



Body flat, elongate, not very hairy ; head cordate, little notched behind, angles 

 blunt, oblique; antennae short, third joint about twice the length of the basal 

 ones, hardly thicker, flat, bent up. smaller on tip, fourth very small, conical, 

 black; mask one-third longer than broad, deeply channeled below, sides sloping 

 to base, which is one-third narrower than front; middle third produced in an 

 elliptical lobe, half as long as broad, with a deep rectangular cleft, and with a 

 comb of flat scales, except in the cleft ; palpus a strongly bent sharp hook, with 

 a few molar incisions ; movable hook long, sharp, bent; wing eases reaching 4th 

 segment ; abdomen flat, lancet shaped, tapering gradually, dorsum slightly 

 rounded; segments of equal length, the last half as long; segments 5 to 9 with 

 sharp lateral hook spines, the last one-third of segment 10; no dorsal hook; scars 

 as usual, light brown ; female genitals marked by two small darker spots; appen- 

 dages a little longer than 10th segment, pyramidal, not very sharp, the laterals 

 one-third shorter, the middle one in some males with two tubercles before tip; 

 legs longer, more slender, hind legs reaching 7th segment, third joint of posterior 

 tarsus about as long as second ; hooks on anterior tibiae rudimentary nearly want- 

 ing. 



The largest of the nymphae shows that a change of skin is imminent, 

 though the female genitals begin to be marked they are all apparently 

 not full grown. The principal character is the largely notched lobe of 

 the mask. I have (Cabot, p. 16) advanced the supposition that thenym- 

 phae may belong to Cyclogomphus, which is, nevertheless, uncertain, 

 except for geographical reasons. 



Sub-genus ? Epigomphus (sui)position). 

 Selys Monogr. Gomphin. p. 84. 



Body more elongate, Aeschna like, third joint of antennae more than three 

 times longer than the two basal, straight, little dilated, fourth very short, ovoid; 

 mask small, once longer than broad, sides oblique, base nearly half as broad as 

 front border, the middle third of which produced in a round lobe with two teeth; 

 abdomen four times longer than broad, flat, very gradually narrowing to tip, seg- 

 ments of equal length, 10th even a little longer than tith; lateral spines on 7 to 9, 

 dorsal hooks on 3 to 9. 



The very unusual length of the last segment, the length of the third 

 joint of antennae and the unusual occurrence of two somewhat prominent 

 teeth near the middle of the rounded lobe of the mask, which is also 

 longer and narrower than in any other species seem to indicate for this 

 species a higher position than a sub-genus. That the species belongs to 

 Epigomphus is still a supposition, but a rather probable one. 



29. Epigomphus? paludosiis? (supposition). 

 Cabot, p. 1, No. 1, pi. 1, fig. 2. 



A full grown nympha (Cabot's type) from Rio Macaros, Brazil, 

 Thayer expedition. Length 34 mm. 



Body Aeschna like, elongate, hairy ; head cordate, hind angles globular, between 

 them two smaller tubercles; third joint of antennse more than thrice the length 



