1912] Alexander — New Crane-fly from Porix} Rico 65 



Megistomastix portoricensis sp. nov. 



Male. Antennse elongate; color light brown; pleurae paler; legs brown. 



Length 5 mm.; wing 7.5 mm.; antennae 9.5 mm.; fore leg, femur, 5 mm.; tibia, 

 6.5 mm.; tarsus, 10.6 mm. 



Vertex produced cephalad into a triangular tubercle; on the sides, at the inner 

 angle of the eye, a shallow depression. Antennae light brown, the flagellar seg- 

 ments darker brown, the long flagellar hairs black. Vertex light brown, with a 

 yellowish median line; front internally light gray, a narrow median brown line 

 extending from the cephalic margin of the vertex forwards; front between the 

 antennae and inner margin of the eye, light brown; genae and occiput brown. Ros- 

 trum and palpi light yellow, palpal segments three and four, darker brown. 



Thorax: prothoracic scutellum light, whitish-yellow; mesonotal praescutum 

 light brown, with indistinct spots of darker brown, the lateral and cephalic edge of 

 the sclerite pale whitish-yellow; scutum, scutellum and postnotum uniform medium 

 brown. Pleurae light brown with an oblique pale stripe extending from near the 

 mesothoracic spiracle to above the mesocoxa. Halteres pale, knob brown. Legs: 

 coxa and trochanters light yellow; femora external face with a light yellow basal 

 streak, rest of the femora and the tibia and tarsi dark brown. 



Abdomen: targura, basel two segments light yellowish-brown; remainder dark 

 brownish-black; hypopygium light yellow; sternum paler brown. 



Wings: light grayish-brown; stigma large, square, occupying most of cell 1st 

 Ri and the distal end of cell C; a brown furrow-like mark in under Cu. Venation 

 (see generic characterization) as in fig. 2. 



Genitalia: 6th and 7th sternites projecting, sheath-like, beyond the basis of the 

 following segment; hypopygium not prominently exserted. Hypopygium (see 

 fig. 3). Suture between sternite and tergite of the 9th segment not very distinct; 

 sternal region (e) produced caudally into a lobe which is broadly and roundly emar- 

 ginated on the ventral aspect, the whole of this projection being clothed with long 

 hairs; tergal region narrow, deeply emarginate, the inner arm (a) bearing a caudad- 

 projecting appendage (b); the ventral or outer arm (c) is more slender and bears 

 three teeth on its inner margin; below this and nearer to the sternal margin is an 

 appendage (d) which is pseudo-segmented; a large pale organ, brown at the tip, 

 projects from the dorsal portion of the genital chamber. The figure is drawn from 

 the unique type and is somewhat compressed under glass. 



Holotype— Male, El Yunque, Porto Rico; 2800 ft.; Feb. 20, 

 1900. C. W. Richmond, collector. (Coll. U. S. Nat. Mus.; Ac- 

 cess, No. 14,592). 



It is barely possible that the Megistocera brasiliensis Wiede- 

 mann (Aussereuropaische Zweifliigeligen Insekten, I; p. 554; 

 pi. VI b.; fig. 13, antenna; 14 wing.) is referable to this new genus. 

 The species is stated by Osten Sachen to be nearly related to Pach- 

 yrhina Macquart (See Osten Sacken, Studies on Tipulidse, p. 

 241; Berliner Ent. Zeitschr., XXXI; [1887]; Pt. 2). 



