172 NEW YORK STATE MUSEUM 



D i a m e s a and C li i r o ii o iii ii 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 a 

 (=C h i r o n o m u s b r e v i i) 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.181, 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. 



Greniis 34. Burmeisteria Weyenbergh 

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



Like Chironomus, but the thorax is narrowed anteriorly 

 and bent downward overhanging the liead (fig.27). The halteres 

 are long and tiat (fig.28), the stem very short, hence covered by 

 the knob. Wings with ciliated margin (fig.3G). 



In the generic description given by Weyenbergh the number of 

 antennal joints is not stated ; although the statement " like 

 Chironomus" would seem to imply that this genus pos- 

 sesses the same number as Chironomus (i. e. 11) . Wej'en- 

 bergh's figure also show.s 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 s]iecies have been re- 

 corded. 



Genus 35. Diamesa ]Meigen 

 Syst Besc-hr. 7:12. 18.38. (P1.30, fifr.1.3, and pl.32, figs. 5 and 14) 

 Larva. The larvne of the known sjtecies are yellowish or 

 greenish in color and are found in swiftly flowing water. In form 

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

 those of Orthocladius. Tlie blood gills of the eleventh 

 abdominal segments, which ai-e usually found in Chironomus 

 are wanting in this genus; their absence i)robably due to the fact 



