AHT. 9 DIPTERA FROM AMERICA, ASIA, AND JAVA ALDRICH 5 



continuing forward as coarse setules, not much larger than the acro- 

 stichals; scuteUuni with a single pair of bristles, far apart. No 

 bristle on outer sioe of hind coxa. Male with globose and somewhat 

 exserted hypopygium, the abdomen rather cylindrical. Wing of 

 male (pi. 1, fig. 2) with distorted venation; in the female (pi. 1, 

 fig. 3) the first vein is short, the second parallel with costa nearly to 

 tip, third vein ending just at tip, fourth diverging moderately, end- 

 ing as far from tip of third as the second does, or very little farther ; 

 hind cross vein behind the center of the wing, a little shorter than 

 last segment of fifth vein; basal cells and sixth vein absent. 



Related to Achalcus, but that has five pairs of acrostichals, two 

 before the suture. In head structure the new genus is very much 

 like Thrypticus^ but that has the venation quite different, the hind 

 cross vein small and retracted, and the anterior part of the thorax 

 is peculiarly bulging and prominent above. Thrypticus also has 

 better developed dorsocentrals. 



Named in honor of J. E. Collin. 



Genotype. — CoUinellula magistri, new species. 



COLLINELLULA MAGISTRI, new species 



Plate 1, Figures 2-4 



Male. — Ver}'^ minute; dark blue-green; legs, antennae, and palpi 

 black. Venation as figured, which alone would make the species 

 instantly recognizable. The groups of long hairs give under low 

 power the effect of slight clouds in the wing. Front tarsi compli- 

 cated in structure; the first joint rather thick and short, widened 

 apically; the second shorter and paler, forming an irregular collar; 

 third somewhat like the second but excised below, the excision partly 

 closed by a transverse plate, and the upper side of the segment with 

 a striking spine at apex; fourth segment very short and tapering; 

 fifth segment as long as the preceding three, very narrow at base, 

 rapidly widening into a triangular flat shape, with dense fine hair 

 and the usual claws and pulvilli. The tarsus is described from a 

 specimen mounted in balsam, its small size making the details prac- 

 tically impossible to see otherwise. Abdomen deep green, the globose 

 genitalia shown in posterior view and spread out (pi. 1, fig. 4), where 

 the rest of the structures are shown in the side view, considerably 

 pressed down. The two median ventral organs anterior to the hypo- 

 pygium are especially noteworthy. Middle femora with a long 

 bristle at base beloAv, 



Length, 1.2 mm. 



Female. — Like the male, but the wings and tarsi are normal, and 

 the eyes do not come entirely together below the antennae, except 

 just at the mouth. 



Length, 1.1 mm. 



