Dolichopodidae. 315 



Geseli. Wien, XV, 1865, 238); it was found under the bark of a spruce 

 in the holes of Tomicins, and it was lying in a fine web; it was taken 

 in May and developed in June. Perris describes and figures (Ann. de 

 la Soc.Ent.de Fr. 4, X, 1870, 321, PI. 4, fig. 105—111) larva and pupa 

 of M. ambiguus; the author found llkewise the larvæ under the bark 

 of firs between larvæ of Tomicus; the pupa was resting in a fme, 

 white, silky cocoon; the larvæ were seen feeding on larvæ and pupæ 

 of Tomicus. Kowarz mentions in his monograph (42, nota) that 

 M. signaticoynis, pinicola and pallipes have been bred from pupæ 

 found under the bark of spruces between Tomicins. Kleine (Berl. 

 Ent. Zeitschr. LII, 1908, 1 10, and Zeitschr. fur Naturwissensch., Halle, 

 81, 1909, 188) observed larvæ and pupæ of M. obsciirus (the author 

 says obscurus Egger) in the holes of Myelophilus piniperda in Pinus 

 silvestris; the larvæ and pupæ were present in both generations of 

 the beetle. The larva fed on the larvæ of the bark-beetle, but 

 also on other larvæ present in the holes. (In the first cited place 

 Kleine describes the larva as amphipneustic and with eyes and prolegs ; 

 in the latter place he says: „Fuss- und augenlos. Stigmen nicht 

 sichtbar" ; there seems here to be some mistake.) The pupa was 

 obtected by a fme, white web or film. Aldrich records (Williston : 

 Manual of N. Am. Dipt. New Haven 1908, 229) that Dr. Hopkins has 

 found larvæ of Medeterus m burrows of Scolytidæ in America. Finally 

 Mr. Kryger has with us bred the species described below as M. melan- 

 cholicus from a larva taken under the bark of an ash, in Hareskov 

 on 1^/4, it pupated on ^^/s and the imago came on ^/g. — The larva 

 of M. ambiguus (Perris) is cylindrical, narrowed in front, broader 

 towards the end; the seven first abdominal segments have each a 

 small, transverse swelling below; the eighth abdominal segment is 

 somewhat rounded, it is exised above at the end so that two small 

 teeth or warts are formed, and below them are two lower, smaller 

 and more approximated teeth or warts. The anterior spiracles are 

 placed a little behind the middle of the prothoracic segment, the 

 posterior on the upper terminal warts. — Besides the described pupæ 

 I have myself examined a pupal skin of M. melancholicus n. sp.; it is 

 of the usual type, the antennal sheaths lie in front down the lower 

 side; at the base of them at the front margin of the head there are 

 two, quite approximated, brown teeth, and lower down two smaller, 

 less close-standing teeth; between those teeth are two short bristles, 

 and more above, to each side of the upper teeth, a similar bristle. 

 Thorax has some short bristles above, and at the front margin two, 

 somewhat long, pointed spiracular tubes, which have a black ring 

 below the apex. The abdominal segments have each a girdle of flat 



