90 



ORTHOPTERA. 



1. Leucophsea surinamensis, Linn. 



Blatta surinamensis, Linn. Syst. Nat. 12th ed. i. 2, p. 687. 3, et auctt. 



Panchlora surinamensis, Burm. Handb. ii. p. 507. 5 ; Sauss. Mem. Mex., Blatt. p. 188. 87 ; Miss. 



Scient. Mex., Orthopt. p. 101. 1; Brunn. de W. Syst. Blatt. p. 278. 12. 

 Blatta indica, Fabr. Ent. Syst. ii. p. 8. 10, et auctt. 

 Pycnoscelus obscurus, Scudd. Bost. Journ. Nat. Hist. vii. p. 424 (larva) . 



Hah. Mexico ; Central America. — Orbem totum inter latitudines calidas. 



PANCHLORA, Burm. 



Panchlora, Burmeister et auctt. (ex parte) . 



Color pallide prasinus, elytris et alis hyalino-thalassinis ; vel brunnescens, rare fusco-irroratus. Oculi invicem 

 propinqui vel modice remoti. Pronotum corneum, laevigatum, postice strigatum (disco rare punctato), 

 utrinque deflexum ; marginibus subreflexis, frequenter hyalinis, dense punctatis. Elytrorum vena discoi- 

 dalis tantum ultra medium a vena humerali sejuncta ; vena media indivisa, vena ulnaris in ramis j>aral- 

 lelis 4-6 divisa, venis spuriis inter illas nullis. Campi analis vense parum numerosse. Lamina supra- 

 analis coriacea, ineisa, frequentius prominula. Femora gracilia ; anteriora apice mutica ; 2 a , 3 a spina 

 genicular: minuta (frequenter deficiente) armata ; intermedia subtus margine postico, posteriora margine 

 antico, spinula apicali instructa. 



Most of the species of this genus are of a milk-white colour, with a greenish tint, 

 like that of clear sea-water (thalassina). The lateral margins of the pronotum and the 

 basal costal area of the elytra are more or less transparent, margined at their inner 

 borders with a white opaque band. In dried specimens the greenish tint is often 

 lost and replaced by a pale fulvous colour ; and the white bands of the sides of 

 the pronotum and elytra sometimes become rufous or reddish. Other species are not 

 greenish, and their white colour is shaded with a brown tint, sometimes very slight, 

 sometimes more pronounced on the elytra. In a few cases the pronotum is marbled 

 with brown. 



The milky-greenish species are very difficult to separate, and some of them remain 

 uncertain, owing to the inconstancy and uncertainty of the details of most of their 

 characters. 



To determine the species of this genus particular attention should be paid to the 

 following points : — 



1. The distance between the eyes on the vertex in the ? and in the <$ (somewhat variable). 



2. The coloration of the antennae : with or without a black stump (subject to become pale or small). 



3. The length of the supra-anal plate ? : produced beyond the last ventral segment, or not (this 



may be a result of the mobility of the plate ?). 



4. The form of the supra-anal plate $ : (a) produced and bilobate ; (b) short, transverse, broadly 



subsinuated, and rounded on each side. 



5. The form of the last ventral segment $ : produced and arcuated; not produced; truncate; or 



emarginate. (Always somewhat, and perhaps occasionally very, variable.) 



6. The number and position of the small black dots on the elytra in certain species : these are very 



