448 PROCEEDINGS OF THE ACADEMY OF [JullC, 



solid blue black, while the A^ellow markings of the head, pronotum and 

 pleura are canary yellow, the contrast being very striking. 



MICROTYLOPTERYX" n. gen. 



Type. — M. hcbardi n. sp. 



Allied to Rhachicreagra Rehn, but differing in the slenderer, more 

 compressed and less obese form, the broader vertex and fastigium, the 

 comparatively larger head (very noticeable in the female), the single- 

 toothed cerci, and uninflated cephalic femora in the male. 



Body more or less elongate fusiform. Head with the vertex short, 

 horizontal, forming a more or less distinct angle with the front, 

 dorsal outline trigonal, the interocular space over half the proximal 

 width of the fastigium; frontal costa weak ventrad, with the sulcation 

 continued on the fastigium; antennae filiform, fifteen or more 

 joints. Pronotum subarcuate longitudinally, tectate, median carina 

 elevated caudad into a distinct subcristate process. Metanotum, 

 proximal segment of the abdomen and in a lesser degree the succeeding 

 segments of the abdomen with a dorso-caudal elevation on the median 

 carina. Tegmina pad-like, considerably longer than broad, not longer 

 than the pronotum. Cerci of the male undivided; subgenital plate 

 compressed. Prosternal spine erect, slender, acute. Interspace be- 

 tween the mesosternal lobes subquadrate in the male, slightly trans- 

 verse in the female ; interspace between the metasternal lobes distinctly 

 longitudinal in the male, subquadrate in the female. Caudal tibise 

 with six to seven spines in the external margin, no apical spine; eight 

 to nine spines, including the apical on the internal margin. Arolia 

 present. 



Microtylopteryx hebardi n. sp. 



Type: d and 9 ; Carrillo, Costa Rica. [Hebard collection.] 

 Size rather large (compared with M. fusiformis); form elongate 

 subfusiform; surface punctate. Head somewhat compressed, the 

 depth considerably greater than the thoracic depth, width at mandibu- 

 lar margins very slightly less (male) or equal (female) to the greatest 

 wddth across the eyes; occiput gently rounded, vertex gently decli- 

 vent, the interspace between the eyes equal to one-half (male) or two- 

 thirds (female) the greatest width of the eye; fastigiiun with the proxi- 

 mal width twice the length, trigonal, with a slight median depression, 

 dorso-cephalic angle narrowly rounded ; face slightly retreating in the 

 female, distinctly retreating in the male, slightly concave; frontal 

 costa weak on the ventral half of the face, distinctly and broadly sul- 

 11 MiKpn, sjnall; tva?/, pad; nrtpv^, wing. 



