—2 7 — 



** BEAK APPARENTLY ARISING FROM STERNUM. 

 Tarsi one- or tico-jointed. All of small she. Antenna' prominent, usually filiform. 

 A. — Tarsi usually 2-jointed, wings, when present, four. 

 B. — Beak 3 or 4 -jointed. 



C. — Antennae 10-jointed Psyllidae. 



CC — Antennae 3 to 7-jointed Aphid.id.ae. 



BB.— Beak 2-jointed Abyrodidae. 



.4,4. —Tarsi one-jointed. Males with two wings, females never winged. Enclosed 

 in waxy scales closely adherent to bark or leaves, or clothed with cottony down. 

 Coccidae. 



PARASITA. 



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



MALLOPHAGA. 



A. — Antennae filiform. Maxillary palpi absent, tarsi short Philopteridae. 



.1.1. -Antenna? capitate. Maxillary palpi conspicuous, tarsi long Liotheidae. 



THYSANOPTERA. 

 These are conveniently grouped in one family Thripidae. 



An abnormal Lucanus cervus * 



At the January meeting of the Society Mr. L. C. Schenk exhibited 

 a $ specimen of Lucanus cervus with apparently somewhat aborted man- 

 dibles. It seemed at first as if here was only a case of accidental injury 

 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, and the point bent inwardly and joining the front under 

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

 The left .side of the head is shorter than the right; but retains the 

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

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

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

 flattened. The front is oblique, the clypeus twisted sideways 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 intergrade between $ 

 and 9 an( -l appear partly to belong to the <$ and parti}- to the 9 head. 

 The palpi are hardly half the length of those of a normal <^\ Altogether 

 this is the most remarkable abnormity it has been my fortune to see. J-l>.^. 



* Read before the Brookl. Ent. Soc. March 1885. 



