70 GEOL. AND NAT. HIST, SURVEY OF MINNESOTA. 



male antenna bears a hook of moderate size. Fifth feet of female 

 short, with a short stout claw and with the inner ramus as long as the 

 basal joint of the outer, one-jointed. The apical joint of the outer ra- 

 mus is obsolescent, bearing small spines. The male feet are almost 

 exactly as in the small form of D. sicilis, but have a process on the 

 basal segment of the outer ramus of the right leg. Length 1.3 mm. 

 Lake Tulan, Fresno, Cal. 



* Diaptoimis novamexicaiius Sp. n. 

 Plate VI, Figs. 7-10. 

 Inter miuores sui generis, modice robustus. Cephalothorax latitudine maxima 

 ante medium sita. Segmentum cephalothoracis ultimum lateribus utriuque mu- 

 cronibus brevibus ornatum. Segmentum abdominale 1-mum utrinque mucrone brevi 

 instructum. Segmentum 2-di per breve. Rami furcales segmentum antecedens 

 longitudine ajquantes, setis apicalibus brevibus. Antenr^ 1-mi pans feminize rttio 

 circiter ad furcam vel interdum ad finem furcse porrectte, articulis 25 composi'aj. 

 Articulus antepenultimus antennte dextra; maris lamina, antice in processu ungui- 

 fore, apicem articuli penultimi vix attingente, productus, armatus. Ramus exteiior 

 5-ti paris apud feminam 3-articulatus, processu nnguifoimi articuli secundi arcuato, 

 intus ad finem denticulate; articulus ultimus distinctus, aculeis 2 brevibus ornatus. 

 Ramus interior 1-articulatus, articulus 1-mus rami exterioris vix longitudine fere 

 ajquante. Pedis dextri 5-ti paris apud marem ramus interior uni-articulatus apicem 

 articuli 2-di rami exterioris attingens, apice acntns, pilis obsitus. Unguis terminalis 

 rami exterioris simpliciter arcuatus. Seta accessoria brevis. Pes sinister articulo 2-do 

 rami exterioris oblongovato, versus apicem intus subtilissime aculeato et duos acu- 

 leos majores portante, ad basin in lamina ciliata extante. Ramus interior simplex, 

 versus apicem ciliatus, vero longus et ultra medium articuli 2-di rami exterioris por- 

 rectus. Animal pleurumque pellucidum, interdum cseruleo vel rubro ornato. Long, 

 feminse 1.1-1.2 mm. 



A small species of rather robust form found associated with D. 

 albiiqmrquensls in the tank of the city water works of Albuquerque, 

 New Mexico. The greatest width is somewhat in advance of the 

 middle. The last cephalothoracic segment is ornamented with small 

 spines only. The first abdominal segment bears on either side a sharp 

 spine. The second segment is quite short. Stylets of moderate 

 length with short setse. Antennae reach the stylets. Antepenult 

 segment with a lamina along its distal aspect terminating in a slightly 

 curved process shorter than the penultimate segment. The segment 

 following the geniculation has a hyaline lamina. The fifth foot of the 

 female has a single-jointed inner ramus of considerable length armed 

 at the apex with two spines and small cilia. The claw of the outer 

 ramus is moderately curved and armed near the tip with a series of 

 teeth, the terminal joint is distinct and bears two small spines. The 

 inner rami of the male feet of the fifth pair are simple and rather 

 long. The terminal claw of the right leg is slightly curved and of 

 moderate length, while the accessory spine is nearer the apex of its- 



