Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor CarUS in Leipzig. 



Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig. 



XY. Jahrg. 27. Juni 1892. No. 394 



Inhalt: I. Wissenschaftl. Mittlieilungen. 1. Packard, On the larva of Lagoa, a Bomby eine 

 Caterpillar with seven pairs of abdominal legs ; with notes on its metamerie glandular abdominal pro- 

 cesses. 2. MacBride, The Development of the Genital Organs, Pseudo-Heart (Ovoid Gland), Axial and 

 Aboral Sinuses in Amphiura squamata. 3. Emery, Älteres über Ameisen in Dornen afrikanischer Aka- 

 zien. 4. Hickson , Note on the female Gonophores oî Errina labiata. 5. Voigt, Die Fortpflanzung 

 von Planaria alpina (Dana). 6. Zoga, Die vitale Methylenblaufärbung bei Hydra. II. Mittheil, ans 

 Mnseen, Instituten etc. 1. Linnean Society of New Sonth M'aies. III. Personal-Notizen. 

 Litteratur. p. 149—156. 



I. Wissenschaftliche Mittheilungen. 



1. On the larva of Lagoa, a Bombycine caterpillar with seven pairs of ab- 

 dominal legs; with notes on its metamerie glandular abdominal processes. 



By Alpheus S. Packard, Brown University, Providence, R. J. U. S. A. 



eingeg. 21. April 1892. 



The following remarks may bear on the question of polypody in 

 the higher metabolous insects. The normal number of pairs of abdo- 

 minal legs in lepidopterous larvae, as is well known, is five. The only 

 known exception is the larva af Lagoa, a genus of Bombycine Lepido- 

 ptera confined to North and South America, and usually referred to 

 the Liparidae. 



In 1864 in the Proc. Ent. Soc, Phil. III., 336, we remarked »There 

 are seven pairs of abdominal or false legs«. 



We afterwards called attention to the presence of two pairs of 

 »false«, or abdominal, legs in the American Naturalist for July 1885, 

 as follows: 



Two years ago we found the fully fed caterpillars and also those 

 before the last molt on scrub-oaks in Providence, and again noticed 

 them while walking, then carefully examined them after placing them 

 in alcohol, and again examined the specimens during the past winter. 

 It is well known that caterpillars have no more ^ban five pairs of »prop- 

 legs«, »false legs« or abdominal feet, as they are variously called , and so 

 far as we have been able to learn the present caterpillar is the only one 

 which has additional legs, even though rudimentary. As in all lepido- 



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