254 BRITISH GUIANA TIPULIDAE 



Male. — Length, 12 to 12.1 mm.; wing, 10.8 to 0.9 mm. 



Fore leg, femur, 7 mm. ; tibia, 8.7 mm. ; tarsal segment 1, 8.8 mm.; tarsal 

 segments 2 to 5 about 7.5 mm. 



Rostrum and palpi black. Frontal prolongation of the head yellow, the 

 nasus very small, indistinct. Antennae with the scajial segments yellow, 

 fiagellum brownish black; segments 4 to 9 of the antennae unipectinate, the 

 pectinations a little longer than the segment, except on the 9th where it 

 is shorter, four apical segments simple. Head brownish gray, somewhat 

 shiny around the base of the antennae. 



Thoracic dorsum gray with four distinct brown stripes, the median 

 pair longest, broad in front, ending in a point behind near the suture; lat- 

 eral stripes short and broad, beginning behind the jiseudosutural foveae, 

 ending at the transverse suture; scutum gray, each lobe with a large brown 

 blotch on the cephalic margin this being a continuation of the lateral prae- 

 scutal stripe; scutellum gray, the caudal half dark brown; postnotum with 

 a gray bloom showing brown in certain lights ; this gray and brown pattern is 

 variable in different lights. Pleura light brown with a gray bloom. Ilalteres 

 rather long, dark brown, pale at the base. Legs, coxae and trochanters dull 

 yellow, femora 3'ellow narrowly dark brown at the tip, tibiae and tarsi 

 brown. Wings with a slight dark suffusion ; stigma brown ; veins dark brown. 

 Venation: cross-vein r connects with Rz just beyond the origin of the latter; 

 i?3+3 longer than R2 alone ; cross- vein r-m short, punctif orm ; cell 1st M2 large ; 

 cell Ml broadly sessile, the portion of Mo that makes up the outer end of 

 cell 1st M-i about one-third as long as cross-vein »i; fusion of Tu, and M3 

 slight equal to about one-third of the cross-vein vi. 



Abdominal tergitc 2 with the basal half pale silvery gray, apical half 

 black; tergite 3 brownish yellow indistinctly ringed with blackish before 

 the middle and at the end of the segment, segments 4 to 6 brownish yellow 

 tipped with black, apical abdominal segments rather uniformly dark; six 

 basal sternites yellow, 7 and 8 brownish black, 9 yellow. 



Holotype, cf , Bartica, February 19, 1913, at light. 



Paratype, cf, topotypic, January 7, 1913, at light. 



From the other species of Ozodicera with the antennae unipecti- 

 nate, pectinata Wiedemann, (jracilis Westwood, griseipennis Loew, 

 simplex Walker and himaculata Enderlein, this form differs conspic- 

 uously in its very small size and gray thoracic coloration. The 

 species above listed have the wing over 15 mm. in lergth, nodi- 

 vagans having it under 12 mm. 



