40 



SCIENCE. 



middle leg. Fig. 4 represents the anomaly as seen 

 from below. The coxa and trochanter are like those 

 of the right leg. On the inferior surface, between the 

 trochanter and femur and embraced in front and be- 

 hind by the latter, is inserted a second trochanter ; 

 triangular in form, about half as wide and one-third as 

 long as the normal one. It gives origin to the extra 

 femur, which is two thirds as long and about three- 

 fourths as stout as the main thigh. The tibia of this 

 extra femur is perfect except that it is one-fourth shorter 

 than the other ; its spurs and tarsal joints and the claws 

 of the latter being all normal. This abnormal leg is 

 less chitinous than the others. 

 In Dr. Horn's Collection. 



SCARITES SUBSTRIATUS, Hald. 



I have tried to represent in fig. 5a monstrosity on 

 the right side of the dorsal surface of the prothorax in 

 a specimen of the Scarites substriatus. It consists of 

 a tubercle about a thirty-second of an inch long, pro- 

 jecting outward and slightly forward. It arises a 

 thirty-second of an inch transversely from the middle 

 of the right margin of the thorax. It is deeply cleft 

 on the summit, almost transversely. Fig. 4a, repre- 

 sents it when viewed from the side. 



Collected in Texas. In Dr. Horn's Cabinet. 



dyschirius globulosus, Say. 



The anomalous right anterior leg of a Dyschirius 

 globulosus is shown in fig. 6. Fig. 5a, represents the 

 normal right leg. The deformity consists in the third 

 joint of the tarsus bearing two branches of two joints 

 each. The inferior terminal spur of the tibia is want- 

 ing. The first two joints of the right tarsus are nor- 

 mal ; the third a little longer, more clavate, and 

 obliquely truncate on each side at tip for the articu- 

 lation of the double set of joints which follow. The 

 two anomalous branches arise on each side of the 

 sharp apex thus formed, one directed to the left, the 

 other to the right. The first joint on each branch is 

 a shorter and stouter than a normal fourth joint ; 

 while the terminal or claw joint does not differ greatly 

 in length. The claw joint of the inner or left branch 

 bears a pair of normal claws, the outer claw joint is 

 somewhat broader and bears two sets of claws curved 

 from each other. 



In Dr. LeConte's Cabinet. 



on, .knits DIFFINIS, Chaud. 



I'ig. 7 represents a deformity in the left middle leg 

 of a specimen of ( 'klctnins dijfinis. The tibia at a 

 point a little below the middle bifurcates, the inner 

 bifurcation continuing to normal length bears the 

 tarsal joints. The outer is about two-thirds as long 

 as the inner. It appears from its size and form that 

 this branch bore a set of tarsal joints similar to those 

 seen on the inner; and this opinion is strengthened by 

 the fact that the end is somewhat ragged and seems 

 to have been broken off. 



In Dr. Horn's Cabinet 



i.k n\ am in. vi i.i'iN \, Hentz. 



A ipecimen of this insect lias an anomalous right 

 antenna as shown m fig. 8. The first three joints are 

 normal. The fourth, fifth, and sixth are fused into 



one joint twice as long as the third ; the seventh ap- 

 pears to be connate with the first joint of the club. 

 From the posterior outer border of the long fourth 

 joint near the tip there arises a spherical club of three 

 joints about the length of the third antennal joint. 

 The first joint comprising the pedicle and base of the 

 club, the second the centre, and the last the apex. 

 In Dr. Horn's Cabinet. 



POLYPHYLLA DECEMLINEATA, Say. 



Fig. 9 represents the right antenna of a specimen of 

 Polyphylla decemlineata in which, in addition to the 

 normal structure, the second joint bears a branch 

 anteriorly, consisting of a single free joint which sup- 

 ports two clubs, placed transversely to the normal, of 

 seven lamellae each, united at their bases. The plane 

 of the normal club is perpendicular to the plane of 

 the abnormal, but in the figure the two are represented 

 as in the same plane ; the normal branch as seen from 

 the outer side, the abnormal as seen from above. 

 Fig. 9b, represents the left antenna. The basal joint 

 of the right antenna is somewhat smaller and more 

 inflated than that of the left. The second joint is 

 twice as long as the corresponding one on the left 

 antenna ; the outer half of the anterior border being 

 flattened for the insertion of the first joint of the abnor- 

 mal branch, and its posterior border somewhat sinuate 

 near the tip. The double club on the abnormal 

 branch consists of two sets, of seven lamellae each of 

 unequal size, united at their bases at an angle of forty- 

 five degrees, the outer scarcely longer than half the 

 inner and more curved, while the inner is but little 

 shorter than the club of the normal branch but more 

 curved than it. The joint supporting these branches 

 is obconical and much shorter than the second joint 

 from which it arises. Fig. 9a, represents the double 

 club as seen from below. The third joint of the nor- 

 mal or posterior branch is in form like that of the left 

 antenna, but a fifth shorter. It bears a club of seven 

 lamellae, which is directed downward, and is about 

 half as long as that of the left side, much narrower 

 and feebly curved. 



The insect is in Dr. LeConte's Cabinet. 



strategus an'iveus, Fabr. 



A specimen of this insect has the left middle leg 

 triplicated. I have tried to represent this monstrosity 

 in fig. 10. It may be regarded as made up of a 

 normal leg with its trochanter entire. To the under 

 surface of this normal femur are added two others, 

 making together a pyramidal mass ; free at their 

 apices for about one- third their length. Those of 

 the normal femur and the one nearest to it are closely 

 placed, while the other diverges at an angle of about 

 forty-five degrees. Each femur is provided with a 

 tibia and tarsus. The tibia of the normal femur is 

 not as greatly developed as the corresponding one on 

 the right leg and those on the two abnormal femora 

 are still less strongly marked. 



In the Museum of Comparative Zoology at Cam- 

 bridge. 



Telephorus rotundicollis, Say. 



A specimen of this insect is deformed in the right 

 antenna as shown in fig. n. The third joint bears 



