172 NEW YORK STATE MUSEUM 



D i a in e s a and C h i r o n o in u s, but easily distinguished from 

 them by the short wings. Type of the genus S . b r e v i p e n n i s 

 (=C h i r o n o m u s b r e v i p e n n i s Boehem) . 



It is not stated in the description whether the wings be hairy or 

 bare. From the statement that the tarsi are a little longer than 

 the tibiae, it appears that the metatarsus is shorter than the 

 tibiae. The genus may, therefore, be most nearly allied to 

 Orthocladius, Camptocladius or to Metrioc- 

 n e m u s . In the description given by the author in Ent. Tidskr. 

 p.l81, 1883, it is stated that the abdomen of the male is narrow 

 and the anal end somewhat thickened almost like that of 

 D i a m e s a . Genus has not been recorded from America. 



Genus 34. Burmeisteria AVeyenbergli 

 Tidj. V. Entomol. 130. 1886. (P1.35, figs. 26-28) 



Like Chironomus, but the thorax is narrowed anteriorly 

 and bent do>AnAyard overhanging the head (fig.27). The halteres 

 are long and flat (flg.28), the stem very short, hence covered by 

 the knob. Wings with ciliated margin (fi^-.26). 



In the generic description given by Weyenbergh the number of 

 antennal joints is not stated ; although the statement " like 

 Chironomus" would seem ip imply that this genus pos- 

 sesses the same number as Chironomus (i. e. 14) . Weyen- 

 bergh's figure also shows about this number. Arribalzaga (1893 

 p.241) states that the genus should be regarded as a synonym of 

 Chironomus sens. str. and further says that the wings are 

 bare. 



The type of the genus is B. photophila Weyenb. (loc. 

 cit.), recorded from Argentina. No other species have been re- 

 corded. 



Genus 35. Diamesa Meigeu 

 Syst. Beschr. 7:12. 1838. (P1.30, fig.13, and pl.32, figs. 5 aud 14) 

 Larva. The larvae of the known species are yellowish or 

 greenish in color and are found in swiftly (lowing water. In fonn 

 they are of the usual C h i r o n o m i d type, most resembling 

 those of Orthocladius. The blood gills of the eleventh 

 abdominal segments, which are usually found in Chironomus 

 are wanting in this genus; their absence probably due to the fact 



