OLIGONTX. 173 



Var. Pronotum et pedes fusco-punctata. 



Long. 36 ; pronot. 9-8, femor. ant. 6*1, elytr. 19, latit. elytr. 5 millim. 



Hab. Mexico, Presidio (Forrer); Guatemala, Cubulco in Vera Paz (Champion). 



In this species the prothorax is relatively much longer than in 0. bollianus 6 , and 

 only half as broad ; the elytra are also proportionately shorter. The wings are not 

 quite so narrow as in 0. striolatus, and the longitudinal veins of the elytra are not so 

 straight. The middle vein and the first ulnar vein are slightly bent at about three- 

 fourths of their length. The anal (subapical) emargination of the wing is more obtuse 

 than in the other species of the genus, somewhat as in Harpagonyx gryps. 



2. Oligonyx bollianus, sp. n. (Tab. IX. fig. 17.) 



3 . Param gracilis, fulvo-griseus. Vertex acute compressus, quadrisulcatus, quam oculi altior, utrinque ad 

 oculos lobo angulato vel rotundato quam vertex medius paulum altiore. Prothorax mediocris pro genere, 

 crassiusculus, superne et subtus punctis nigris graniformibus conspersus ; parte postica quam pars antica 

 paulo longiore, marginibus subtilissime denticulatis ; collo pro genere parum elongato, retro dilatato, mar- 

 ginibus anterius convergentibua. Elytra et alae subhyalina. Elytra 6 m segmentum abdominis tegentia, 

 apice anguste rotundata, venis longitudinalibus basique venularum transversalium griseis vel fuscis. Alae 

 angustae, venis subrectis ; illis costae et apicis ut in elytris griseo-inquinatis ; vena ulnaris ultra medium 

 furcata, ramis subarcuatis, postico apice breviter curvato. Coxae anticae prothoraeis basin retro superantes, 

 dentulis marginis antici nigris. Trochanteres intus macula ovata nigra. Femora sensim prothoraeis 

 longitudine, intus basi macula ovata nigra, ultra sulcum unguicularem infuscata : extus fusco-punctata. 

 Tibiae nonnunquam fusco-punctatae, superne linea nigra ; spinis sat validis apice nigro ; basi dentulis 2. 

 Pedes 2 a , 3 a nigro punctati. Lamina supra-analis carinata V-formis, apice rotundato ; cerci longiusculi. 



5 . Lobi elytrales et alares strigati, haud separati. Abdomen valde carinatum, segmentis 6°-9 m plus minus 

 tumidis ; 7°-9 m supra fere in dentem excurrentibus, 9° angulato; lamina supra-anali marginibus leviter 

 arcuatis. 



$ . Long. 32-5 ; pronot. 8*8 ; femor. ant. 7-3, lam. supra-anal. 2 millim. 



<5 . Long. 36 ; pronot. 8*8, femor. ant. 8-5, elytr. 23*5, latit. elytr. 5 - 3 millim. 



Hab. Noeth America, Dallas in Texas (Boll). — Northern Mexico (Mus. Genavense). 

 Closely allied to 0. scudderi, Sauss., which is a little more slender. 



3. Oligonyx striolatus, sp. n. (Tab. IX. figg. 18-22.) 



S . Minor, fulvescens, fusco-irroratus ; pedibus fusco-fasciatis, vel fere omnino fuscis. Vertex transversus, quam 

 oculi parum altior, lobis juxta-ocularibus leviter prominentibus, juxta illos per sulcum distincte ineisus. 

 Prothorax parum elongatus, sparse granulatus ; marginibus distincte denticulatis ; ampliatione rhom- 

 boidali ; collo mediocri ; parte postica quam pars antica sesqui-longiore. Elytra et alae elongata, hyalino- 

 grisea, venis longitudinalibus brunneis. Elytra ad medium 5 1 abdominis segmenti extensa, inter venas 

 griseo-irrorata, venulis transversis hyalinis, ad exsertionem brunneis. Campus marginalis venulis omnibus 

 brunneis, parum obliquis, basi per venam mediastinam in partes 2 aequales divisus. Alarum areas 3 

 marginales venulis transversis brunneis instructae. Coxae anticae retro basin prothoraeis paulum 

 superantes, granulatae, margine superiore et anteriore distincte denticulato. Femora extus granulata, 

 spinis crassiusculis, parum elongatis, nigris ; margine interiore ante spinas toto distincte serrulato. Tibiae 

 spinis mediocribus aimatae ; spina externa arcuata sed haud a basi ineurva ; margine interno basi dentulis 

 3-4. Lamina supra-analis stylos vix superans, apice hebetato-rotundata, haud acuta. 



Var. Elytra et campus anterior alarum venis longitudinalibus hie illic decoloribus (Duefias, Champion). 

 Long. 31-5 ; pronot. 6-3, femor. ant. 6, elytr. 21-5, latit. elytr. 4-5 millim. 



