OF WASHINGTON, VOLUME XVI, 1914 169 



NOTES ON THE LARVA OF HYDROSCAPHA AND SOME OTHER 

 AQUATIC LARVAE FROM ARIZONA. 1 



(With Plates XVII :md XVIII.) 

 BY ADAM BOVIXG, Pn.D., Bureau of Entomology. 



In the material brought home by Mr. E. A. Schwarz and Mr. 

 H. S. Barber from Arizona are four hitherto unknown aquatic 

 Coleopterous larvae, collected in December, 1913, in the hot water 

 at the Castle Hot Springs. Mr. Schwarz and Mr. Barber have 

 been so kind as to ask me to determine these larvae. 



Two of the forms are undoubtedly Hydrophilid larvae, namely : 

 those of Helochares nor mains Lee. and Creniphilus subcupreus Say. 



A European larva of the genus Helochares (H. lividus Forst.) 

 has recently been described with a good figure -in the excellent 

 work of A. d'Orchymont 2 and I am well acquainted with this 

 larva which has been reared by Mr. Wm. Schlick (May 21, 1889, 

 and Mr. E. Rosenberg May 12, 1895) in Denmark. 3 the Ameri- 

 can species conforms exactly with the European generic type and 

 the specific determination cannot be in doubt because Helochares 

 normatus'Lec. is the only species of the genus found in the locality. 



The second Hydrophilid larva, Creniphilus subcupreus, was also 

 collected in connection with the adult ; it belongs to the Hydrobius 

 group, which is well known from Schiodte's description and fig- 

 ure of Hydrobius fuscipes.* 



The third larva (fig. 1) cannot be definitely determined. With- 

 out doubt, however, it belongs to the Helodidae of the Cyphonid 

 or Microcara type, with which family it agrees in the remarkable 

 shape of the hairy mouth-parts, the hypopharynx and epipharynx 

 and in the presence of anal gills. Unfortunately the antenna? 

 have been broken in both of the specimens of which the material 

 consists. 5 The Helodidae are represented as adults in the material 

 by specimens of a new species of Scirtes, (cf. the preceding paper 

 by Mr. E. A. Schwarz.) 



1 Presented at meeting of April 2, 1914. 



2 Contribution a 1'etude des larves Hydrophilides, "Annalesde Biologic 

 lacustre, Tom. vi, 1913, p. 200." 



3 I take the opportunity to mention that the larva described by M. 

 d'Orchymont as Laccobius (?) does not belong to this genus. The larva 

 of Laccobius has been bred in Denmark from eggs, by Mr. Wm. Schlick and 

 has later been followed through all stages by Dr. Wesenberg Lund. 



4 This figure, by the way, is not quite correct because it shows the ante- 

 rior edge of what Schiodtc calls the clypeus, straight, and not asymmetric, 

 as it is in this entire group. 



5 Compare the very interesting statement about the dimorphism of the 

 antennae by P. de Peyerimhof: "Le double type larvaire de Prionocyphon 

 serricornis Mull." Bulletin de la Soc. Ent. de France, 1913, No. 6, p. 148. 



