60 Fhitz Johansen and I. C. Nielsen. 



2. Pachyrrhina Lundbeckii Nielsen. 

 3 specimens; the end of June 1908. 



3. Chironomus hyperboreus Stæg. 



A number of specimens swarming over a moss on June 23 

 1907. All the specimens are somewhat darker than the other Green- 

 land specimens I have seen. 



4. Chironomus sp. Tanypus sp. 



Several specimens of a smaller Chironomus which could not be 

 determined with certainty, and several larvæ of Chironomus and 

 Tanypus species. 



5. Culex nigripes Zett. 

 Some specimens; August 1907. 



A pair of larvae almost or perhaps quite full-grown have been 

 brought home; they were all somewhat rubbed. 



The length of the largest larva is ca. 12 mm. The body is 

 greenish; the head and air-tube brown. The upper side of the head 

 bears 6 simple bristles (fig. 8), of which 4 are placed on a flat curved 

 line between the bases of the antennae and the two others somewhat 

 further back between the central ones in the anterior row. On each 

 side of the labrum there is a short and thick, inwardly curved 

 bristle. The antennae are beset with fine serrations and have two 

 simple bristles at the middle. 



The prothorax has on each side 8 bristles, which in the younger 

 larvae are divided into several, in the older into a large number of 

 rays. On the anterior margin there are three, close together and a 

 little in front of the middle three and posteriorly two single. The 

 two succeeding segments bear on each side at the middle a bristle 

 with several rays, the following segments on each side two bristles 

 with several rays and posteriorly on the upper side two bristles^ 

 divided into rays. 



The 8th segment has at the sides a row of pointed, posteriorly 

 directed, depressed and elongated spines (fig. 9). On the underside 

 there is a bristle with four rays. The air- tube is three times 

 as long as broad. The under side has two rows of backwardly 

 curved, fine chitinous spines (fig. 10), which bear a tooth at the base; 

 the spines increase in size outwards and reach out to the middle of 

 the air-tube; between the two outermost there is a bristle with 

 three rays. 



The under surface of the 9th segment bears several bristles with 

 several rays and on the posterior margin of the under surface there are 

 some dense clumps of bristles. The caudal appendages are almost 

 twice the length of the ninth joint segment, narrow and pointed. 



