OF WASHINGTON, VOLUME XVI, 1914 163 



Fig. 33, interior view of a piece of the head of a dry specimen; ad, adduc- 

 tor mandibuli; epc, epicranium; md, mandible; /, tendon; ap, process to 

 which antenna? muscles are attached. 



Micropteryx ammanella Hiiber, imago, figs. 34-37. 



Fig. 34, dorsal view of head; ant, antenna; epc, epicranium; ha, hair- 

 bearing area; Ir, labrum, md, mandible; ocl, ocellus; pg, pilifer; pi, post- 

 labrum; ta, spot indicating the interior attachment of tentorial arm. 



Fig. 35, upper portion of head from inner side; an, antennal ring; ex, 

 epipharynx; md, mandible; ocl, ocellus; pg, pilifer; ph, pharynx; r, endo- 

 skeletal rod; I, tendon of mandible; la, tentorial arm. 



Fig. 36, ventral view of head; c, cardo; epc, epicranium; g, galea; h, hy- 

 postoma; /, lacinia; II, labial lobe; 1st, labial stipes; m, mentum; mp, max- 

 illary palpus; pig, palpiger; s<7, subgalea; sm, submentum; st, stipes; tb, 

 tentorial bridge. 



Fig. 37, lower portion of head from inner side; epc, epicranium; g, galea; 

 hx, hypopharynx; I, lacinia; II, labial lobe; mxl, maxillula; Ip, labial pal- 

 pus; r, endoskeletal rod; sg, subgalea; t, tendon of mandible; ta, tentorial 

 arm; tb, tentorial bridge. 



PLATE XVI. Mnemonica auricyanea Walsingham. 



Fig. 38, young mine and egg puncture in chestnut leaf. 



Fig. 39, old mines. 



AQUATIC BEETLES, ESPECIALLY HYDROSCAPHA, IN HOT 

 SPRINGS, IN ARIZONA. 1 



BY E. A. SCHWARZ, Bureau of Entomology. 



In 1891 on the occasion of the meeting of the A. A. A. S. at 

 Washington, D. C., I prepared for publication a letter just received 

 from our lamented friend and former president of this Society, 

 Mr. H. G. Hubbard, relating to insect life in the hot springs of 

 the Yellowstone National Park. This letter has been published 

 in the Canad. Ent., vol. 23, pp. 226-230. At the same time I 

 made myself a little acquainted with the literature on insect life 

 in hot water and found that in America there is only one paper 

 referring to this subject, namely by Dr. A. S. Packard, published 

 in the American Naturalist on a Stratiomyid (Diptera) larva 

 found in Wyoming. (This same paper is mentioned by Dr. 

 Sharp in the Cambridge Nat. History.) In this instance the 

 Dipterous larva was found in hot water estimated only 20 or 

 30 below the boiling point. In the case of Mr. Hubbard's obser- 

 vations in the Yellowstone Park he expresses his regrets at not 



. * Presented at meeting of April 2, 1914. 



