32 FAUNA HAWAIIENSIS 



CoENOsiA Meigen. 



This genus appears to be represented in the collection before me by about twenty 

 species. I have been unable to trace any description that can safely be applied to even 

 one of these forms and have therefore described thirteen as new and left the rest (owing 

 to bad or insufficient material) undetermined. The majority of the species described 

 below are much larger than the average size of European and North American forms of 

 this genus. The following table will facilitate their identification : 



1. Palpi yellow 2. 



black (/j) C. ingens. 



2. Antennae entirely yellow 3. 



„ partly or entirely dark 7. 



3. Fore tarsi flattened and distinctly broader than the tibiae (j) C. latimana. 



„ slender, narrower than the tibiae 4. 



4. Fore and intermediate tarsi light yellow or dark at the tip only 5. 



„ „ entirely dark 6. 



5. Abdomen 6-spotted, hind femora dark at the tip (7) C.flavobasalis. 



., not spotted, hind femora entirely yellow {2) C. semiiiigra. 



6. Thorax with dorsum and pleurae both covered with yellow tomentum ...(j) C. dexioides. 



,, „ cinereous and pleurae yellowish {4) C. va/ida. 



7. Abdomen cinereous, unicolorous, not shining [12) C. n/di's. 



,, shining black, hind borders of the segments very narrowly 



edged with yellowish-grey (6) C. disjxir, ?. 



,, partly yellow 8. 



8. Abdomen with paired spots on the middle segments {11) C. biseta. 



,, without paired spots o. 



9. Abdomen with the three terminal segments banded anteriorly with 



cinereous ; wings brownish in apical half, clear in basal half (/o) C. longipes. 



Abdomen not thus banded ; wings uniformly tinged 10. 



10. Yellow of abdomen on the two bjisal segments 11. 



„ „ confined to the basal segment [g) C. striata. 



11. Antennae entirely dark (6) C. dispar, $. 



,, partly yellow 1 2. 



12. Thorax covered with yellow tomentum (7) C. iriangulifera. 



» » dark grey tomentum {8) C. kaiiaiensis. 



(i) Coeiiosia flavobasalis, sp. nov. 



t. Long. 5 mm. ; al. 4^ mm. Front about one-fourth of the w^idth of the head, 

 reddish-brown, orbits and vertical triangle light yellowish-grey ; face silvery white ; palpi 

 pale yellow ; antennae entirely pale yellow, arista dark brown, yellow at the base and 

 distinctly but shortly plumose. Thora.x and scutellum yellowish-grey, shoulders more 

 distinctly yellow, pleurae and metanotum light cinereous ; two presutural dorso-central 

 bristles. Halteres light yellow. Abdomen with the first segment entirely yellow, second 



