92 



PSYCHE. 



[June 1S91. 



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

 know. 



SCARABAEIDAE. 



Lachnosterna fusca Froh. (PL 2, 

 fig. 8). This is on the whole the most 

 singular monstrosity with which I have 

 met. It concerns the middle leg of 

 the left side. The femur of normal 

 length is extraordinarily enlarged so as 

 to form a cuneate piece, at its apex 

 nearly as broad as half the length of the 

 femur. From both the anterior and pos- 

 terior extremities of the expanded sub- 

 compressed apex there arises an inde- 

 pendent tibia ; the anterior is sub-nor- 

 mal, having all the parts but the tibia 

 somewhat reduced in size and of more 

 uniform width throughout, the tarsi 

 entirely normal and complete. The set 

 of members arising from the posterior 

 extremity of the expanded femur con- 

 sists of a tibia similar in length and in 

 general appearance to the other but 

 stouter and deeply cleft on its outer face 

 to the depth of fully one third its length. 

 Each of the uniform halves thus cleft 

 presents the normal pair of apical spurs 

 and is followed by a series of tarsi in 

 general respects normal but of rather 

 diminished size, and the upper having 

 the terminal joint not bullate at the ex- 

 tremity but terminating in a conical 

 point without any claws. 



The origin of this specimen I do not 

 know; it is now in the Museum of 

 comparative zoology at Cambridge. 



Polyphylla decefnlineata Say (PI. 

 2, fig. 6) . A right antenna in which 

 the first and second joints are normal, 



the third not larger than usual but bear- 

 ing two fourth joints : the first articulated 

 at the tip, the second articulated on the 

 anterior face, the articulation occupying 

 all of it but the part close to the base ; 

 both fourth joints are formed in general 

 like the normal fourth joint ; the first is 

 directed backward and bears a normally 

 formed set of laminae, seven in number, 

 but small and directed subparallel to, 

 though not so much curved as, those of 

 the left antenna ; in this case the second- 

 ary fourth joint differs from the normal 

 fourth only in being smaller to about 

 the degree that the laminae are smaller 

 than normally. In the second case the 

 fourth joint is greatly swollen and bears 

 at its broad apex a very peculiar set of 

 lamellae, which from the first show their 

 intention to divide ; three are undivided, 

 but irregular in shape, more or less im- 

 perfect, and attached not by one ex- 

 tremity but near the middle, the longer 

 portion directed anteriorly and a little 

 inward ; the shorter in an opposite 

 direction, each curved downward ; the 

 first two of these are flat laminae, a little 

 thickened at the point of attachment ; 

 the third is enormously thickened at 

 this point and produced into a triangular 

 projection, upon either side of which 

 are attached the remaining laminae, 

 four anterior and three posterior, the 

 division of this portion of the bifid an- 

 tenna taking place at this point. 



This specimen was shown me by Dr. 

 J. L. LeConte, but I did not learn its 

 origin. 



Cotalpa lanigera Linn. Instances 

 are quite frequent in which the longer 



