PSYCHE. 



221 



head more deeply sinuate at base. The 

 plate will give an idea of the more salient 

 features, the figures being drawn by Mr. 

 P. C. Myers and the author. Fig. i is 

 an outline of the type specimen, a is the 

 mandible, b the maxilla, c the labium 

 (in which the palpus is shown on one 

 side onl)', the paraglossa on the other), 

 d the antenna and e the hind tarsus. 

 Figs. 2a, 2b, and 2d represent hitherto 

 unfigured details of Platyinedon laticolle 

 which are of interest in this connection. 

 It will be noticed that the terminal 

 antennal joint is sinuate or somewhat 

 ogival at tip. The mandibles are stout- 

 er than in Stilicus hanJiami. The fourth 

 joint of the maxillary palpi is extremely 

 minute and scarcely visible except by 

 careful preparation. The four teeth of 

 the labrum (fig. 2f) are unequal, the 

 outer being much smaller than the inner. 

 A nest of Lasiiis niger was examined 

 at Iowa City on May 5th. The galleries 



were in and under old logs. Running 

 with the ants were seen two individuals 

 of Myrmobiota crassicornis Casey. They 

 are difficult of detection owing to their 

 habit of keeping close to their hosts and 

 mingling with the moving mass. My 

 other specimens of this beetle were 

 taken in August so that this record 

 points to the probability of hibernation 

 or of a double brood. 



During a six weeks' trip to Colorado, 

 some effort was made to add to the 

 records of myrmecophiles, but the 

 season was so far advanced that but 

 little success was achieved. At Colora- 

 do Springs two species were taken, 

 which, with their hosts, have been iden- 

 tified by Prof. Jerome Schmitt. These 

 were Batrisus frontaHs which was found 

 in the runways of Lasius tiariger be- 

 neath a log ; and Batrisus globosus which 

 occurred in a colony of Camponotus her- 

 culcanns. 



A STUDY OF THE CATERPILLARS OF NORTH AMERICAN 

 SWALLOWTAIL BUTTERFLIES. — II. 



BY SAMUEL H. SCUDDER, CAMBRIDGE, MASS. 



From these statements vye see that 

 there is a somewhat general uniformity 

 of type in the earliest stage of larval 

 life among the Papilionini, while there 

 is an extraordinary diversity in the same 

 caterpillars when full grown. Some 

 of them alter very much less than 

 others, some assume the mature aspect 

 b}' slow degrees, and others at a start 

 .and at very diflerent periods of life. 



Thus maturity may be said to be as- 

 sumed at the second stage by Laertias 

 and Iphiclides, at the fourth by Hera- 

 clides and Papilio, in the course of the 

 fourth stage by Jasoniades, and not 

 until the final stage by Euphoeades. 

 This assumption of maturity consists in 

 several distinct features which in gen- 

 eral are correllated : the form of the 

 body, the broad features of the coloring 



