1919] Weiss — Notes on Eustrophits Bicolor Fabr. 133 



Eustrophus bicolor Fabr. 



Full-grown Larva. Length 6 to 7 mm. Width 1.5 to 1.8 mm. 

 Elongate, subcyUndrical, sparsely hairy, whitish or sordid white 

 except head which is dark and the dorsal surfaces of the thoracic 

 and abdominal segments which bear dark brown to black subrec- 

 tangular transverse areas giving the dorsal surface a banded 

 appearance. Head large; antenna 4-segmented, each segment sub- 

 cylindrical, basal segment widest, second segment shortest, third 

 segment bearing the slender fourth segment and a minute spine. 

 Maxillary palpus subcylindrical, 3-segmented, almost as long as 

 antenna, first and second segments subequal in length, third seg- 

 ment one and one-half times length of first. Labial palpus sub- 

 cylindrical, short, 3-jointed, joints equal in length. Abdominal 

 segments one to eight slightly produced at sides. Ninth abdominal 

 segment bears two dorsal, prominent, reddish-brown tubercles, 

 each tipped with a chitinous hook slightly curved anteriorly. 

 Bases of dorsal tubercles covered with minute, dark tubercles each 

 bearing a hair. Legs well developed, sparsely hairy, anterior 

 surfaces of femora well supplied with minute spines. Dorsal 

 surface of head bears a subcircular, faintly impressed line. Faint, 

 median, whitish line on dorsal surface of first and second thoracic 

 segments sometimes continuing on abdominal segments. Spir- 

 acles on second thoracic and abdominal segments one to eight. 

 Abdominal spiracles just below dorsal colorations. 



Pu-pa. Length 5 to 6 mm. Width, 2 mm. Whitish, elongate- 

 oval, rounded anteriorly, gradually tapering posteriorly. Head 

 and thorax covered with minute tubercles, each bearing a long hair. 

 Transverse patches of similar hair-bearing tubercles on dorsal 

 surfaces of remaining segments. Ventral surface almost devoid 

 of hairs. 



Adult. This was described by Fabricius in 1798 (Ent. Syst. I, 

 p. 497). Sharp^ states that about 200 species of Melandryidoe are 

 known, chiefly from temperate regions and that they frequent dry 

 wood or fungi. He also says that the few described larvae are 

 varied in their details and cannot be generalized at present. 

 Blatchley^ writes that E. bicolor is common throughout Indiana, 

 January 19 to September 20 and found beneath bark especially 

 that of fungus covered logs. 



1 Sharp, D., The Cambridge Natural History, Insects, Part II, p. 265. 

 2Blatchley, W. S., Coleoptera of Indiana, 1910. 



