—27 — 



** BEAK APPARKNTLY ARISING FROM STERNUM. 

 Tarsi one- or two-joinled. All of small size. AnieamK prominent, KsuaUyjUlform. 

 A. — Tarsi usually 2-iointecl, \viiiu;s, when ]ircsent, four. 

 B. — Beak 3 or 4-jointed. 



C. — Antennae lo-joinied Psyllidae. 



CC — Antennns 3 to 7 -jointed Aphididae. 



BB. — Beak 2-jointed Abyrodidae. 



.L4. -Tar .-<i one-jointed. Males with two wings, females never winged. Enclosed 

 in waxy scales closely adherent to l)ark or leaves, or clothed with cottony down. 

 Coccidae. 



PARASITA. 



The American species are contained in one family Pedicul'dae. 



MALLOPHAGA. 



A. -Antenna; filiform. Maxillaiy pnlpi absent, tarsi short Philopteridae. 



.L4.- -Antenna* capitate. Maxillary palpi conspicuous, tarsi long Liotheidae. 



THYSANOPTERA. 



These are conveniently grouped in one family Thripidae. 



An abnormal Lucanus cervus * 



At tlie Jantiarv meeting of the Societ}' Mr. L, C. Schenk e.xhibited 

 a rj' sp)ecimen of Lucanus ccrvus with apparently somewhat aborted man- 

 clii)les. It seemed at first as if here was onlv a case of accidental injtirv 

 in an early stage; but more careful study has developed a very interesting 

 malformation. In size the specimen ratner exceeds the average (^ of 

 cervus, and up to the head, is normal. The right side of the head to the 

 mandible, is normal, the antenna complete. The mandible is distorted, 

 lacking the teeth, ami the point bent inwardl}- and joining the front under 

 the labrum. It is perfectly immobile, and forms an irregular loop. 

 The left side t^f the head is shorter than the right; but retains the 

 normal sculpture to the tront. The antenna is aborted, the basal joint 

 much shorter than that of the opposite side, tlie remaining joints irregu- 

 lar, the club wanting. The eye is irregular in shape, and somewhat 

 tlattened. The front is oblique, the clypeus twi.sted side\va3's by the 

 right mandible. The left mandible is wanting, its place occupied by an 

 imperfect female head, with two perfect though immobile mandibles. The 

 palpi and labrum are aborted and form a queer inlergrade between (^ 

 and 9 ^11^1 appear partly to belong to the (^ and partly to the 9 head. 

 The palpi are hardly half the length of those o( a normal (^. Altogether 

 this is the most remarkable abnormity it has been my fortune to see. J.B.S. 



* Read hefore the Erookl. Knt. .Soc. March 1885. 



