S. A. Arendsen Hbin 261 



and rather specially to the condition when the tarsus of all three pairs 

 of legs consisted of five segments. (No. 88.) 



From 35,247 beetles tested as to their tarsi, 60 individuals were 

 found whose third pair of legs showed five segments. 



Three generations were bred of these, without any result. If the 

 deviation did reappear at all, the frequency of it was not greater than 

 in any population taken at random. 



Nos. 42, 43. Of the two claws on the last tarsal segment, one or both 

 may be lacking. The single claw then lies in the axial line of the 

 tarsus. 



No. 44. Equally rare is the case pictured in Fig. 16/^, where the 

 tarsus bears three claws. [This is evidently a form of reduplication of 

 the terminal joint.] Normally the two claws diverge and are curved 

 outwardly. Sometimes they are straight and parallel to each other and 

 to the axial line of the tarsus. 



i. Femur and Tibia. 



No. 45. The decrease of the number of tarsal segments may or may 

 not be accompanied with a reduction of the tibia alone, or of the femur 

 and tibia together. 



No. 46. Femur and tibia may, however, be reduced with a normally 

 built tarsus. 



No. 47. The two spurs on the distal extremity of the medial edge 

 of the tibia may be lacking, which is often associated with a reduction 

 of the number of tarsal segments of the leg. 



No. 48. Not quite so rare is the absence of one leg or both legs of 

 a pair, in which case, however, coxa and trochanter are still extant. 



Only in intenser disturbances it may occur (as was mentioned 

 already in No. 1 5, Fig. 11^) that even of these two elements of the 

 leg no rudiments were left. 



No. 49. A very singular anomaly which was found only once, con- 

 sisted in a fusing of the two coxae of the first pair of legs into one, on 

 which both legs (otherwise normally built) were implanted. Also the 

 two articular cavities were fused into one single cotyle, lying exactly in 

 the median line. 



Numerous other anomalies may occur in the legs, upon which we 

 shall not enter now. They consist in the appearance of excrescences, 

 accessory spines in places where spines do not normally occur, abnormal 

 thickenings, reduplication of the tarsus, whether or not provided with 

 the normal number of tarsal segments, etc. 



