MAY FLIES AND MIIMJKS ()!' NKW >(>ItK 



1G3 



jointed, the last joint elongated. Antennae of the male 10- 

 jointed, the first joint thick and disk like. Hie following eight egg 

 sha])cd, the last one thicker and longer than the others, all with 

 long hairs, the last one vert iciilal e ; antennae of the female 

 I jointed, the first one thick and disk-like, the following four 

 ellipsoidal, the last one somewhat elongate, all with short 

 hairs. Eyes round, ocelli wanting. Mesothorax greatly arched, 

 prolonged over the head, without transverse suture; sen tell urn 

 small: meiathorax much arched. The 8-jointed abdomen is 

 narroAv and long. Legs elongated; slender; the posterior pair 

 of tibiae somewhat thickened, spurred; metatarsi elongated; 

 claws and pulvilli very small. Wings in outline club-shaped, 

 bare, and bent down; anal angle wanting; anterior margin 

 thickened. Halteres free; venation as shown on pl.36, fig.7. 

 Genitalia of male shown on pl.32, fig.4 (after Kieffer). Antennae 

 of male 11-jointed according to Kieffer (1899). 



Of the larvae and pupae of the members of this genus, but one 

 species has been described as far as I am aware; i. e. Cory- 

 no n e u r a 1 e m n a e Franenfeld (1866) . (Pl.36, figs. 1 to 5.) 

 He describes the larvae as filiform, thickened anteriorly, white, 

 with distinct incisnres ( fig.l ) . The chitinous pale brown head 

 is oval, with two black eye spots. The antennae 1 3-jointed 1.5 

 times as long as the head. The first thoracic segment is in the 

 form of a truncated cone, upon the ventral side of Avhich is a 

 cephalad projecting 1 process, with a bilobed extremity, each lobe 

 possessing a crown of delicate setae. The next thoracic segment 

 largest, with two oval, stigma-like spots on each side. The fol- 

 lowing 8 gradually deceasing in size; the last is nearly cylindri- 

 cal, and has upon the dorsal surface a prominence upon which 

 there are several upright setae. There are two anal blood gills 

 and two prominent anal prolegs, at the extremity of each of the 

 latter there is a circle of curved setae. Length 3.7 mm. 



The pupa is described as being smooth and pale yellow in color; 

 the wing sheaths being one third of the entire length. The ab- 

 dominal segments are distinct; the anal end is blunt, upon each 

 side with a hyaline crescent-shaped disk, each with 8 long setae 

 upon its margin (fig.4 and 5). Length 1.2 mm. The imago 

 resembles 0. s c u t e 1 1 a t a "\Vinn. (an European species) . 



