94 Rey. A. EH. Eaton’s Monograph 
busque subtus circa media, pellucidis: ? abdomine 
nigricante, latera juncturasque versus ochraceo, et subtus 
virescenti-griseo tincto. E lateribus segmentorum api- 
calium setulz tenues pallide breves producuntur. Setz 
obscure, juncturis nigricantibus. 
Long. corp. ¢ 4-5, 2 6; al. ¢ 4-5, 2 7; set. ¢ im. 
14 & 15-15 & 16, subim. 3; set. 9 im. 3°5 & 2, subim. 
3mm. 
Hab.—England; Switzerland ; Voslau (Brauer); Lap- 
land (Zet.). May to September. 
Spiders’ webs and painted surfaces have provided me 
with dried specimens in widely distant localities. They 
fly at Reading from about 4°45 until 8 or 9 a.m., and 
again in the cool of the afternoon and evening, in June. 
I have seen subimagines with the dew thick upon their 
wings, resting on a flood-gate of the canal at 5.30 a.m. 
in June; and when the sunlight reached them, they 
immediately began to moult. 
Cenis (?) chironomiformis. 
(?) Brachycercus chironomiformis, Curt. 1834; (?) Canis 
chironomiformis, Ste. 1835-6. Oxyeypha lactea, Burm. 
1839; Coenis lactea, Pict. 1843-5. (?) C. halterata, Hag. 
1863. 
(Margine membrane subgenitalis ¢ anguste furfuroso, 
haud nigro veluti in precedente.) 
Imago, v. s.s. Caput et thorax brunneo-lutescentes, 
nervis alarum obscuris. Pedes albicantes, femoribus 
anticis brunneis. Abdomen supra griseum, apicibus 
segmentorum et linea longitudinali media albicantibus, 
“‘strigisque indistinctis e spiraculis atris ; venter flaves- 
cens” (Hag.). Sete sub-fuscescentes; forceps et margo 
membrane subgenitalis anguste furfurosi absque macula 
basali obscura. 
ong. “corp. 9 45°exp. ali” 9°73 set. 2) Uimam \ 
(Pict:). 
Hab.—England (Curt.) ; Prussia (Burm., Hag.); Lake 
of Geneva (Pict.). In May. 
The only specimens I have seen of this insect are in 
M. Pictet’s collection: one (or more) of them is in 
spirits. The penis of this specimen was very similar in 
form to that of a dried specimen of C. macrura. 
Sr 
