406 



ventral fusiform transverse areas, and in the shape of the apical seg- 

 ment, the latter being of uniform width to apex, and having 4 short, 

 widely separated protuberances, the lower pair distinctly longer than 

 the upper, the latter bearing the posterior spiracles. 



The pupa of this genus resembles closely that of Medcterits, but 

 the thoracic respiratory organs are figured as long as head and thorax 

 together, with distinctly tapered apices. The fore tarsi extend be- 

 yond the apices of the wings and the dorsal abdominal segments each 

 have a band of locomotor spinules consisting of about 3 series, the 

 anterior one of which is much stronger than the others. Neither 

 Medeterus nor Systenns has the abdominal spiracles pedunculate. 



Brauer figures the larva of Dolichopus acneus De Geer. The head 

 shows an upper T-shaped piece whose anterior portion is considered 

 as the labrum, and on each side of this plate are the sickle-shaped 

 mandibles; the maxillae are not chitiriized and their palpi are short 

 and blunt ; the antennae consist of 2 joints. The posterior cephalic 

 rods are represented as slender, the upper pair slightly broadened pos- 

 teriorly and exceeding in length the lower pair. The body is figured 

 with 7 pairs of pseudopods, the apices of which are armed with rather 

 strong spinules. The apical segment terminates in 4 short subequal 

 protuberances. 



The pupa has the cephalic capsule with 4 small warts above, and 

 below these 2 others. The thoracic respiratory organs are very long 

 and slender. 



The larva of a species of Dolichopus is figured herein (PI. LVII, 

 Fig. 3). This is Larva (b) of C. A. Hart's paper previously referred 

 to, which he described at the conclusion of the part dealing with 

 Brachycera. All three species therein referred to are of this genus. 



References to Papers on the Biology of North American and 



European Dolichopodidae 



Brauer, F. 



Denschr. k. Akad. Wissensch., Wien, math.-naturw. CI., 47 : 44. 



(1883) 



Felt. E. P. 



Jour. Econom. Ent, 4 : 414. (1911) ; Can. Ent, 45 : 373. (1913) 



Griinberg, K. 



Die Siisswasserfauna Deutschlands, Heft 2a, Erster Teil, p. 167. 

 (1910) 



