Mascaromyia Bickel, 1994

Grichanov, I. Ya., 2020, Two new species of Mascaromyia Bickel, 1994 (Diptera: Dolichopodidae) from Mauritius Island, Caucasian Entomological Bulletin (Caucas. entomol. bull.) 16 (2), pp. 201-205 : 201-202

Genus Mascaromyia Bickel, 1994

Diagnosis. See Bickel [1994], Grichanov [2017] and Grichanov and Brooks [2017] for diagnosis of the genus. An adaptive radiation of the generic group on the Mascarene islands is briefly discussed by Grichanov [2017]. Thirty one species of Mascaromyia are known from western Indian Ocean islands, including three species known only by females. The body length of flies occurring on the Island is 3 to 5 mm. Females of close species are practically indistinguishable.

Key to Mascaromyia species from Mauritius (males)

1. Thoracic pleura entirely yellow; lateral margins of mesonotum and basal segments of abdomen yellowbrownish (female of M. rufiventris (Macquart, 1842) belongs to this group) ...................................................... 2

− Thorax and abdomen metallic; at most metapleuron and first two abdominal segments partly yellow (females of M. desjardinsi (Macquart, 1842) and M. mauritiensis (Parent, 1939) belong to this group) ............................. 4

2. Vein M 2 and apical part of M 4 absent without fold or indication on membrane .... M. bickeli Grichanov, 1996

− Wing venation undistorted .................................................. 3

3. Hind leg yellow; fore basitarsus shorter than fore tibia ... ............................................ M. babichae Grichanov, 1996

− Hind leg mostly brown; hind tibia white in basal 1/3; fore basitarsus 1.3 times as long as fore tibia .......................... ........................................ M. makhotkini Grichanov, 1996

4. Fore femur with ventral row of mainly black fine bristles decreasing in length distally, with basal bristle yellow-brown, 1.5 times longer than femur height; mid femur with ventral row of white hairs; segment 5 of fore tarsus black, enlarged and flattened dorsoventrally ... ................................................................. M. courtoisi sp. n.

− Fore femur without long bristles, at most with 1−2 fine setae at base; mid femur usually bare; other features various ................................................................................. 5

5. Fore basitarsus about as long as rest tarsomeres; posterior margin of wing in apical half foggy ................................... ........................................ M. leptogaster (Thomson, 1869)

− Fore basitarsus long and thin, more than twice as long as rest tarsomeres; wing evenly darkened or hyaline ...... 6

6. Face nearly as wide as postpedicel ..................................... 7

− Eyes nearly contiguous in the middle of face ..................... 8

7. Last segment of fore tarsus strongly enlarged, black ........ ........................................ M. shabuninae Grichanov, 1996

− Last tarsomere simple, short, darkened ............................... ............................................... M. hutsoni Grichanov, 1996

8. Hind tarsus white ...................... M. albitarsis Parent, 1935

– Hind tarsus dark-brown ....................................................... 9

9. Antenna yellow, legs yellow, tarsi brownish; fore basitarsus 10 times longer than 2 nd− 5 th tarsomeres combined ................................. M. dytei Grichanov, 1996

− Antenna black, hind femur progressively brown towards apex, hind tibia brown; fore basitarsus at most 3 times longer than 2 nd− 5 th tarsomeres combined .................. 10

10. Fore tarsus white, with basitarsus 3 times as long as rest tarsomeres ....................... M. kalinkini Grichanov, 1996

− Fore tarsus dark, with basitarsus either 2 or 3 times as long as rest tarsomeres .................................................. 11

11. Fore basitarsus 3 times as long as rest tarsomeres .......... ................................................................... M. rochati sp. n.

− Fore basitarsus 2 times as long as rest tarsomeres ............. ................................................. M. frolovi Grichanov, 1996