250 MR. walker's catalogue of dipterous insects 



from the very oblique and rather long discal transverse vein ; subanal 

 vein curved. 



66, Mystia attrahens, n. s. Mas. Pieea, capite albido lineis ni- 

 gris, thoracis disco vittis duabus latis nigris interlineatis, abdomine 

 cyanescenti-purpureo maculis duabus basalibus rufescentibus, pedibus 

 nigris, femoribus pallidis, alis subcinereis, costa maculaque nigrican- 

 tibus. 



Male. Piceous ; head whitish, with two black bands between the eyes, 

 and with two black stripes on each side of the face ; disk of the tho- 

 rax whitish cinereous, with two broad black stripes, which are inter- 

 lined with whitish cinereous ; metathorax whitish cinereous ; abdo- 

 men bluish pur])le, with a reddish spot on each side at the base ; legs 

 black ; fore femora ferniginous, with black tips ; posterior femora 

 yellow, with black tips ; wings slightly cinereous, blackish along the 

 costa and along the praebrachial transverse line, and with a blackish 

 spot at the hind end of the prajbrachial transverse vein ; veins black. 

 Length of the body 4 lines ; of the wings 8 lines. 



Gren. Dacus, Fair. 



6/. Dacds devius, n. s. Mas et Foem. Piceo-niger, capite cyaneo 

 vitta antica testacea, arista albida pubescente, thorace vittis tribus cine- 

 reis, tibiis anticis ferrugineis, tibiis posterioribus albidis, tarsis jwsteri- 

 oribus testaceis, alis cinereis, costa venisque transversis fusco nebulosis. 



Male and Female. Piceous black, with slight cinereous tomentum ; 

 head blue, whitish about the eyes, ferruginous and with a short broad 

 testaceous stripe in front ; antennae reaching the epistoma ; 3rd joint 

 slender, linear, full six times the length of the 2nd ; arista whitish, 

 pubescent, much longer than the 3rd joint ; thorax with three cine- 

 reous stripes ; pectus pale cinereous ; fore tibiaj ferruginous ; pos- 

 terior tibia; whitish, with black tips ; posterior tarsi testaceous ; wings 

 cinereous ; exterior part of the costa and transverse veins irregularly 

 clouded with brown ; veins black ; cubital vein hardly angular ; prae- 

 brachial transverse vein long, veiy oblique ; halteres whitish. Male. 

 Abdomen cylindrical, testaceous towards the tip, longer than that of 

 the female ; praebrachial transverse vein curved, parted by one-fourth 

 of its length from the border, and by much less than its length 

 from the discal transverse. Female. Abdomen slightly attenuated 

 at each end ; praebrachial transverse vein nearly straight, parted by 

 hardly more than half its length from the discal transverse. Length 

 of the body 5-5^ lines; of the wings 9-10 lines. 



Distinguishable by the wing-veins from D. divergens and from D. addens, 

 to which it is much allied. 



68. Dacus instabilis, n. s. F(e.m. Fulvus, oculis albido cinctis, 

 epistomate guttis duabus nigris, thoracis disco abdomineque cyaneis. 



