210 THE CANADIAN ENTOMOLOGIST. 



cephalic leg, cephalic tibial spur terminating in three fine spine-like points; 

 strigils absent. A pair of rather distinct claws on each tarsus. Tro- 

 chanters pallid, weakly 2-jointed. 



Antennae : Scape, pedicel, minute ovate ring-joint, one funicle joint 

 and a 3-jointed club. Scape cylindrical, moderately long, curved, about 

 twice the length of the rather long pedicel, slightly longer than the 

 flagellum ; ring-joint cup-shaped, very small, often completely hidden, 

 appearing as a small bulb-like base at the funicle joint ; pedicel 

 long-ovate, nearly thrice longer than broad at the apex, obconic, nearly as 

 long as the club ; the single funicle joint small yet very much larger than 

 the ring-joint;, longer than wide, subcuneate, narrower than the pedicel and 

 the club, and subequal in length to the proximal club joint. Club 

 3-jointed, ovate, the intermediate joint somewhat longest, the proximal 

 joint slightly wider than long ; articulation between the second and third 

 joints indistinct, apparently absent in some cases. Pubescence apparently 

 absent. 



Mandibles with two distinct, equal, acute teeth ; three normal ocelli 

 on the vertex, the lateral ones near to but not touching the eye margins. 

 Pronotum short, parapsidal furrows complete, distinct, curved ; sides of 

 abdomen clothed with sparse, long, stiff hairs, in more or less distinct, 

 weak clusters. Abdomen long and pointed, the ovipositor exserted for 

 about half its length (protected by the valves nearly to tip)*; abdomen 

 sessile. Abdominal segments largef, distinct; scutellum and metathorax 

 simple, weak but rather large. Eyes naked. 



(From three specimens, two-thirds-inch objective, one-inch optic, 

 Bausch and Lomb.). 



The foregoing notes taken from three females, Berlin, Germany, 

 mounted together on a slide and deposited in the collections of the Illinois 

 State Laboratory of Natural History, Urbana, 111, as accession No. ^^,2j/. 

 The species, though aquatic and swims with its legs, shows no marked 

 adaptive structures for such a life ; the hairs along each side of the 

 abdomen, however, probably serve to protect the spiracles from the water. 



*I can make out but six abdominal segments, the sixth or last one being- long" 

 and tubular, reachirg nearly to the end of the ovipositor and completely sheathing 

 its valves. Hence, in one sense only the distal end of the ovipositor is exserted. 



fThe tubular distal segment is nearly a third as long as the remainder of the 

 abdomen. The fifth segment of the abdomen is conical, rather broad at base 

 and taken in conjunction with the sixth, which it enfolds at the latter's base, 

 dorsad, is as long as half of the abdomen ; the other segments are rectangular, 

 somewhat wider than long, their margins straight. 



