564 TRANS. ST. LOUIS ACAD. SCIENCE. 



merely tuberculous in the latter. The lateral ridge, as found in 

 Epicauta and Meloe^ is not conspicuous, and in this respect, as 

 well as in the final transformations taking place within the two 

 unrent skins, the insect approaches Sitaris. In the hairless and 

 unarmed surface of the second larva, and of the third larva and 

 pupa, as shown by careful examination of their shrunken exuviae, 

 the insect also resembles that genus. I take great pleasure in 

 dedicating the genus to Dr. Horn, who has so well studied the 

 structural characters of our Meloids. 



HoRNiA, Nov. Gen. — Head oval deflexed, suddenly constricted poste- 

 riorly ; clypeus emarginate in front; labrum transverse, truncate; men- 

 turn slightly longer than wide, rounded in front; labial palpi with the last 

 joint elongate-oval; maxillary palpi with the and joint rather longer than 

 the others, the terminal joint somewhat longer than the preceding and 

 elongate-oval ; mandibles moderately prominent, acute at tip ; antennae 

 filiform, slightly flattened, ii-jointed, slightly arcuate, as long as head and 

 thorax in the % , scarcely longer than the head in the 9 > joint i ro- 

 bust, conical, 2 transverse, 3 somewhat longer than the others, 4-10 

 equal, 11 longer than the preceding and oval at tip. Scutellum cordi- 

 form. Elytra very small, semicorneous and translucent, oval, diverging 

 from scutel, reaching to and resting against the first abdominal joint. 

 Hind wings of same form but not \ as large as elytra, through which 

 they may be discerned. Meso- and metathorax very short and constricted ; 

 side pieces small, partly covered at anterior end by the elytra. Tarsi spinu- 

 lose, claws simple. Abdomen 8-jointed, elongate-oval, large, membran- 

 ous; in the %, with two series of approximate, subquadrate, semicorneous, 

 dorsal plates, and two more rounded, more widely separated ventral series; 

 in the 9 these plates are obsolete. First abdominal joint covered beneath 

 by the metasternum. First pair of spiracles mesothoracic. 



H. minutipennis, n. sp. — % Head, palpi, prothorax, and legs, rufous 

 antennae and horny abdominal plates darker; labrum, wings, and elytra, 

 whitish ; abdomen yellow. All the corneous parts, as also the elytra, 

 sparsely covered with short stiff" dark hairs. Head, prothoracic and semi- 

 corneous abdominal plates, also sparsely punctulate. There is a dark, 

 transverse, narrow line in the suture between metathorax and abdomen 

 also similar sutural lines between the ventral plates. Length 16 mm. 



9 Differs from % in the antennae being scarcely longer than the head ; 

 in the semicorneous pieces on metanotnm more nearly covering the same : 

 in the semicorneous plates entirely lacking on the venter, which is more 

 evenly spinulose; in the dorsal plates, except on the anal joint, being sub- 

 obsolete and colorless; and in the color of the abdomen being whiter. 



Four % 's and one examined. 



Ultimate stage of second larva with the jaws broad and simple, the other 

 mouth-parts as in Epicauta, but with the three leg-parts well separated 

 and tapering to a single tarsal point (PI. V., Fig. 13, d). 



