242 ME. WALKER^S CATALOGUE OF DIPTEROUS INSECTS 



(Formosia), seems to be distinct from the following species, though nearly 

 allied to it : — 



47. RuTiLiA LUCIGENA, n. s. Mus et Fam. Lsete cyanea, capitis 

 tomento albo, frontalibus atris, anteunis pedibusque nigris, thorace 

 vittis quatiior interruptis nigris, abdomine atro fascia interrupta ma- 

 culisque quatuor posterioribus subquadratis cyaneis micantibus, alis 

 fuscescentibus basi nigricantibiis. Foem, Frontalibus purpureo niar- 

 ginatis. 



Male and Female. Brilliant blue ; bead with white tonientum on each 

 side in front ; frontalia deep black ; antennae and legs black ; thorax 

 with four interrupted black stripes, which resemble those of the pre- 

 ceding species, with the exception of the outer pair being longer and 

 narrower; abdomen deep black, its brilliant bluish marks hardly 

 differing from those of R. moveta which it also resembles in the 

 colour and structure of the wings. Male. Frontalia elongate-trian- 

 gular. Female. Head purple on each side of the linear frontalia. 

 Length of the body 8 lines ; of the wings 16 lines. 

 These three species, and especially the two latter, are very closely allied, 

 and may be termed subspecies. 



Gren. DOLESCHALLA, u. g. 



Mas et Foem. Corpus gracile, cylindrieum. Fades subobliqua. Palpi 

 longi, graciles. Antenrue epistoma non attingentes ; articulus S""* 2" 

 quadruplo longior ; arista plumosa. Abdomen longum. Pedes longi, 

 •graciles. Alee angusta;. Mas. Abdomen longissimum. Fcem. Ab- 

 domen brevius et latins. 

 Male and Female. Body slender, cylindrical, with a few bristles. Head 

 as broad as the thorax ; frontalia widening in front ; face slightly 

 oblique ; facialia without bristles ; epistoma prominent. Mouth 

 slender, with long slender palpi. Antennae not reaching the epistoma ; 

 3rd joint hnear, slender, about four times longer than the 2nd ; arista 

 plumose, rather longer than the 3rd joint. Abdomen and legs long 

 and slender. Wings narrow ; prajbrachial vein forming a slightly 

 acute angle at its flexure, near which it is much curved inward, and is 

 thence straight to its tip, the latter being at a short distance from the 

 tip of the cubital vein ; discal transverse vein undulating, parted by 

 hardly less than half its length from the border, and by about its 

 length from the flexure of the praebrachial ; alula; large. Male. 

 Abdomen very long. Female. Abdomen long, a little broader than 

 that of the male. 

 The name of this genus, which has some affinity to Scotiptera, is in 

 remembrance of the late Dr. Doleschall, whose researches and publications 

 have contributed much to the knowledge of the Diptera of the Dutch 

 East Indies. 



48. D0LE8CHALLA CYLiNUKiCA, u. s. Mas. Cinereo-nigra, capite 



