122 MB. r. WALKEB OlS 'KEW SPECIES OF DIPTERA 



Gen. Dacus, Fahr. 



53. Dacus speculifer. Mas. Niger, capite luteo guttis quatuor 

 nigris, thorace vittis duabus approximatis cinereis, callis vittis duabus 

 lateralibus scutelloque flavis, abdomine fascia flavescente, pedibus 

 lut.eis, alis limpidis strigis duabus basalibus plagaque maxima quadri- 

 guttata nigricantibus, halteribus albidis. 



Male. Black. Head pale luteous, witb two black dots on each side be- 

 tween the eyes ; face short, with a black dot on each side. Antennae 

 piceous, much longer than the face ; third joint linear, much longer 

 than the second ; arista slender, bare. Thorax with two nearly con- 

 tiguous cinereous stripes ; humeral calli, two hindward lateral stripes, 

 four pectoral calli, and scutellum yellow. Abdomen short oval, 

 shorter and a little broader than the thorax, with a yellowish band 

 before the middle. Legs pale luteous. Wings limpid, with two 

 blackish basal streaks, of which the hind one extends to the hind 

 border, and the fore one is connected with a very large blackish 

 patch; this occupies more than two-thirds of the costa, is dilated 

 twice to the hind border, and contains two limpid dots and two ex- 

 terior limpid points; veins black; discal transverse vein oblique, 

 parted by one-fourth of its length from the border, and by rather less 

 than its length from the oppositely oblique praebrachial transverse 

 vein ; halteres whitish. Length of the body 4^ lines ; of the wings 

 9 lines. 



54. Dacus biarcuatus. Mas. Niger, capite fulvo guttis quatuor 

 nigris, thorace callis strigis duabus scutelloque flavis, pedibus piceis 

 tarsis flavis, alis albidis strigis duabus basalibus plagaque maxima 

 strigam emittente fuscis, halteribus flavescentibus. 



Male. Black. Head tawny, shining, with a black dot on each side of 

 the vertex, and a larger black dot on each side of the face. Antennae 

 slender, piceous, much longer than the face ; third joint linear, as long 

 as the first and second together ; arista very slender. Thorax with four 

 yellow calli ; two humeral ; one near the base of each wing, extending 

 to the pectus ; a yellow streak on each side hindward ; scutellum 

 yellow, with two minute protuberances on the hind border. Ab- 

 domen elongate oval, not shorter and hardly narrower than the 

 thorax. Legs piceous ; tarsi yellow, darker towards the tips ; anterior 

 tibiae partly yellow. Wings whitish, lurid along the basal part of 

 the costa; two brown basal streaks, one proceeding to the hind 

 border, the other contiguous to a very large brown patch, which is 

 excavated at the base, joins the hind border, extends along the costa 

 to the tip of the wing, and emits a streak to the border behind the 

 tip ; veins black ; discal transverse vein undulating, parted by one- 

 fourth of its length from the border, and by a little less than its 

 length from the oblique praebrachial transverse vein; halteres yel- 

 lowish. Length of the body 44 lines; of the wings 8 lines. 



