598 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



length of the maxilla from condyle of cardo to end of palpus, is as 

 6 : 3. Prothoracic tergal shield along middle line about as long as one 

 of the frontal sutures; prothoracic sternal plate broadly lanceolate. 

 Legs medium sized. Abdomen with normally developed interseg- 

 mental membranes; sci^o-scutellar suture deep, with anterior and 

 posterior branches evanishing and with an accessory, ventrally di- 

 rected, deep branch developed in continuation of the main suture ; no 

 distinct mediotergal subdivision, scutum and scutellum almost com- 

 pletely separated from alar area ; postscutellum narrow ; an anterior, 

 large preeustemal area separated by a deep transversal suture from 

 a small eusternal area ; parasternum large, meets the corresponding 

 opposite area in the middle line ; mediosternellum and laterosternel- 

 lum normally built. Basal plate of cerci large, well chitinized, an- 

 teriorly well defined, laterally rounded, somewhat expanded beyond 

 the attachments of the cerci, covers a great part of the dorsal surface 

 of ninth abdominal segment. Cerci paired, widely separated, rather 

 small, each cercus with a small projection carrying two exceptionally 

 long setae. Tenth abdominal segment prominent, with four large 

 soft-skinned papillae in front of anus. Spiracles annuliform-bifore, 

 with the finger-shaped tubes pointing backwards both on the thoracic 

 and abdominal spiracles. In general appearance and many im- 

 portant characters Necrobia is closely related to the genus Enoclerus. 

 The association of the genus Phyllohaenus with the genus Necrohia, 

 as indicated by Brues and Melander in Key to the families of North 

 American Insects, Boston, 1915 (p. 35), is not supported by the 

 classification of the larvae. 



NECROBIA RUFIPES Degeer. 



No. 486, U. S. N. M. Mature larva taken together with pupa and adult. 



Total length ^ of body, about 10 mm. ; extreme width, about 2 mm. ; 

 fifth to seventh abdominal segments widest; anterior width of pro- 

 thorax one-half the width of the seventh abdominal segment; ex- 

 treme thickness, 1^ mm. ; seventh abdominal segment thickest. Cor- 

 neous parts shiny, brown ocher ^ ; delicately chitinized parts shiny, 

 pale clay yellow ; membranous parts of thorax and abdomen dorsally 

 mauve or lilac with white muscle attachments, ventrally whitish with 

 bluish pattern; while alive probably with four small round con- 

 spicuous red marks in a transverse row on the dorsal side of most 

 segments.'' Frons rugose, anteriorly on each side of middle line 



^ The Clerid larvae vary individually considerably in size, according to the food con- 

 diUons. The measures given for each species refer as a rule to the type specimen 

 mentioned. 



2 For nomenclature of colors see John B. Smith in his Explanation of terms used in 

 Entomology, 1906. 



•According to A. Kemmer (see bibliography), such punctures are found In living speci- 

 mens of the two Neorobia species studied by him, but disappeared in specimen preserved 

 In alcohol. 



