no 



with an obtuse tubercle. Compound eyes, round, black; legs 

 strong, suited to digging; abdomen terminating in three plumose 

 stylets. Length of largest example taken at Quincy 1.20 inches. 

 The food consists of earth richly charged with dead organic mat- 

 ter and with unicellular plants and animals. Such protozoans as 

 Euglena are quite common in it. A large part of the contents of 

 the digestive tube is sand, which seems to be taken incidentally 

 This is, in all probability, the young of H. bilinecda. 



It was common in Broad Lake; but elsewhere it was not often 

 taken. 



Localities: Willow Slough, Lily Lake, Long Lake, Broad Lake, 

 Wood Slough. 



Ccenis, nymph (1). 



A small brown form with three long, fringed caudal apjjendages, 

 and with the respiratory appendages on segments 1-5 of the abdo- 

 men ; those on segments 3-5 concealed by the plate-like pair of the 

 second abdominal segment. First respiratory appendages small, 

 erect, not concealed. Head without conical tubercles. Antenujv, 

 legs, and caudal appendages white, with brown annuli. 



A few examples were taken in Willow and Wood Sloughs. 



Ccenis, nymph (2). 



A second small nymph, from Willow Slough, has three promi- 

 nent conical tubercles on the head which agree very closely with 

 those of the European species C. Ivcfuosa, as figured in Mr. Eaton's 

 monograph of this group of insects. Our insect differs in having 

 the prothorax narrowed towards the front; and in certain other 

 characters does not quite agree with Mr. Eaton's description of the 

 genus. 



AKACHNIDA. (Spiders and Mites.) 



Tetragnatha grallator, Hentz. 



(Hentz, Bost. Jour. Nat. Hist., vi, 26, PI. iv, figs. 1 and 2.) 



A small, slender-bodied, long-legged spider, large examples of 

 which are .50 inch in length. Extremely common about the 

 sloughs and lakes, often living over the water, exposed on d( ad 

 stems and branches. It was sometimes brought in by the small 

 seines in situations such that it seemed it must have been in the 

 water. Its food probably consists of small gnats. 



Arrenurus sp. 



A pale water mite with long ciliated legs was frequently takea 

 by surface nets in the deep water of the bay. It is, I believe, a. 

 river species. 



