172 NEW YORK STATE MUSEUM 



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

 them by the short wings. Type of the genus S. brevipennis 

 (^C h i r o n o m u s brevipennis 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, Oamptocladius 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. 



Genus 34. Burmeisteria Weyenbergh 

 Tldj. V. Eintomol. 130. 1880. (P1.35, figs. 26-28) 



Like Ohironomus, but the thorax is narrowed anteriorly 

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

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

 the knob. Wings with ciliated margin (fig.26). 



In the generic description given by Weyenbergh the number of 

 antennal joints is not stated; although the statement ''like 

 Ohironomus" would seem to imply that this genus pos- 

 sesses the same number as Ohironomus (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 synon^^m of 

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

 bare. 



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

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

 corded. 



Genus 35. Diamesa Meigen 

 Syst Beschr. 7:12. 1838. (P1.80, fig.l3, and pl.32, figs. 5 and 14) 

 Larva. The larvae of the known species are yellowish or 

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

 they are of the usual li 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 Ohironomus 

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



