MORGAN HEBARD 



33 



dish brown and huffy; very different and more decidedly special- 

 ized male subgenital plate and styles, and caudal margin of cephalic 

 femora, which arc armed only with a single distal spine. 



Type. — cf ; Mobile, Alabama. August 26, 1915. (Rehn and 

 Hebard.) [Hebard Collection, Type no. 419.] 



Description of Type. — Size small, form rather broad, structure very delicate. 

 Head as given in generic description; interocular space broad but distinctly nar- 

 rower than the very broad interantcnnal space; ocellar spots very weakly defined. 

 Maxillary palpi with third and fifth (distal) joints subequal in length, fourth slightly 

 shorter. Pronotum with cephalic margin transverse, lateral margins broadly con- 

 vex and moderately divergent caudad, caudal margin transverse, very weakly con- 

 vex mesad and very weakly conca\'e meso-laterad; cephalic angles very broadly 

 rounded obtuse-angulate, caudal angles rather broadly rounded and nearly rectan- 

 gulate. Exposed portion of tegmina subquadrate, longer than wide, but extending 

 only slightly beyond margin of first dorsal abdominal segment; costal margin 

 very broadly and evenly rounding, at slightly more than a right angle, to sutural 

 margin, which is nearly straight, angle at sutural margin sharply rounded, rectan- 

 gulate. Seventh and eighth dorsal abdominal segments very narrow and with 

 only caudal margins showing. Supra-anal plate small, transverse, triangularly 

 produced, with lateral margins weakly concave and apex truncate. Cerci not very 

 elongate, twelve jointed, tapering rather sharply distad to acute apex, deplanate 

 above, convex below with decidedly narrow, flattened lateral margins. A mass of 

 subchitinous tissue fills the proximal portion of the anal chamber, from which pro- 

 ject mesad, from a chitinous base, two minute, chitinous spines, directed dorsad 

 and cur\ing weakly dextro-caudad. Subgenital plate convex, distad with surface 

 divided into two convex portions terminating in broad sockets, in these rest the 

 very broad and short styles," which are almost completely fused with the plate; 

 sinistral style, a low rounded ridge se\eral times as broad as long and not projecting 

 beyond the lateral margin of the plate; dextral style, a thick, corneous, rounded 

 projection, on the inner margin about twice, on the outer three times, as long as 

 wide, straight, directed diagonally mesad, with apex blunt and not narrowing; this 

 style is strongly concave within and could almost be termed hollow, while in this 

 orifice is situated a moderately stout, chitinous projection, about twice as long as 

 broad, the blunt apex of which does not project beyond the apex of the style; be- 

 tween the styles the brief mesal portion of the distal margin of the plate is weakly 

 and irregularly produced." Limbs and armament of same as given in generic de- 

 scription. Yentro-caudal margin of cephalic femora with only a single spine, this 

 situated distad. 



■*' The simple styles in immature males of the present species are heavier than those 

 in the corresponding instars of diapliana. 



*^ This development is evidently a decidedly greater siiecialization of structures 

 homologous to those found in diaphaua. 



MEM. .\M. ENT. SOC, 2. 



