90 



PSYCHE. 



[June 1891 



the very margin of the limb ; posteriorly 

 it shallows, narrows gradually, and ter- 

 minates in a point back of the division 

 of the primary tibia. A similar but not 

 so distinct groove is seen beneath, and 

 at the tip beneath three instead of two 

 prominent spines are visible. It is evi- 

 dent, then, that the inner portion of this 

 supernumerary leg is exhibiting a ten- 

 dency itself to divide in two places : at 

 the tip of the tibia and at the tip of the 

 tarsi ; the only indication in the parts 

 lying between these two points is in the 

 very trifling greater width of all the 

 tarsal joints. 



This specimen was received from Mr. 

 Frederick Blanchard of Lowell through 

 Mr. E. P. Austin. It is now in the 

 Museum of comparative zoology in 

 Cambridge. 



Dyschirius sp. (PI. 2, fig. 7). Of 

 this species I have only notes and rough 

 sketches referring to the right front 

 tarsus. The 1st and 2d joints are nor- 

 mal ; the 3d is longer than usual, bent 

 a little forwards, and bears at the bend 

 a 4th joint and at the tip another ; that 

 at the tip bears a normal 5th joint with 

 claws as usual only a little smaller ; that 

 at the bend bears an altogether similar 

 5th joint only the claws are still smaller, 

 scai'cely curved, and a second still more 

 abortive pair of claws is found at the 

 outer edge close to the tip, thus show- 

 ing signs of double bifidity. 



The specimen was shown me by Dr. 

 J. L. LeConte, but its origin I do not 

 know. 



Amara muscidus Say (PI. 2, fig. 2). 

 The right antenna is 12-jointed ; the left 



antenna is affected as follows: joint 1-6 

 normal (the first not shown in the figure) 

 7th a very little enlarged apically, the 

 better to support the abnormal 8th joint, 

 which is depressed and beyond the base, 

 here slightly larger than usual, ex- 

 pands and forms a sublenticular mass 

 slightly longer than broad, with a dis- 

 tinct straight impressed line down the 

 middle of the upper inner surface (as if 

 made up of two connate joints) ; it is of 

 the normal length. Each of these two 

 lateral halves bears an appendage of 

 four almost precisely similar joints, the 

 exact counterpart of those of the oppo- 

 site antenna except in being a very little 

 smaller though of the same proportions ; 

 the lower is borne at the extremity of 

 the lower half, and is continuous with 

 the antenna ; while the upper is attached 

 to the upper outer angle of the upper 

 half and trends a little away from the 

 normal direction; the 9th, 10th and 

 1 ith joints of this half are a trifle shorter 

 than those of the other more normal 

 half. 



The specimen came from Massa- 

 chusetts, and was received from Mr. 

 Samuel Henshaw. 



Galerita janus Fabr. (PI. 2, fig. 1). 

 The specimen of this species which I 

 have to describe briefly, is not greatly 

 malformed. Malformation occurs in the 

 right hind leg, the femur of which is 

 perfectly natural, and the tibia is of nor- 

 mal length and clothing, but is perhaps 

 a little sw r ollen, and considerably twisted 

 from a point slightly beyond the base, 

 the curvature being more or less sinuous, 

 at first and most strongly backward, at 



