MOW 'i I:K STATI-: 



D i a 111 e s a and r h i r o n o in u s, but easily distinguished from 

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

 (=C h i r o n o in 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 arc a little longer than 

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

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

 < > r t h o c 1 a d i u s , C a m p t o c 1 a d i u s or to M e t r i o c - 

 n em us . In the description given by tin- author in Knt. Tidskr. 

 p.181, 1883, it is stated that the abdomen of the male is narrow 

 ;ind 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 \Ye\enl>er^h 

 Tiil.j. v. Kntomol. 130. 1886. (P1.35, figs. 26-28 



Like Chironornus, but the thorax is narrowed anteriorly 

 and In-lit down ward overlian.uin.u (he head Mig.i'Ti. The halteres 

 are long and llai Mig.LNi. the stem very short, henre covered by 

 the knob. \Yings with iliated mar-in i liu.-'i i . 



In the generic description given by \\Cyenbergh the number of 

 antennal joints is not stated; although, the statement "like 

 Chi ro nonius'' would seem to imply that this genus pos- 

 sesses the same number as C h i r o n o m u s (i. e. 14) . Weyen- 

 bergh's figure also shows about this number. Arribalzaga (is'.c; 

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

 C h i r o n o m u s sens. str. and further says that the wings are 

 bare. 



The type of the genus is B. ph.otoph.ila Weyenb. (loc. 

 eit.). recorded from Argentina. "Xo other species have been re- 

 corded. 



Genus 35. Diamesa Meigen 

 Syst. Besclnv 7:12. 1838. (P1.30, fig.13, 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 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 C h i r o n o m u s 

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



