Rhyparochromus nigriceps Dallas , List Hemipt. Brit. Mus. 2 : 577 , 1852 Hemiptera Heteroptera of Guam Usinger, Robert L. (Dallas) Dallas [560,1184,848,890] Insecta Lygaeidae Pachybrachius Animalia Hemiptera 19 30 Arthropoda species nigriceps       Rhyparochromus nigriceps Dallas, List Hemipt. Brit. Mus. 2:  577, 1852.      Twospecimens, Guam, Fullaway;   nine specimens, Piti Hills,  June3, sweeping   Styphelia, Swezey;   32 specimens,  2 milessouth of Piti,  June 13, on heliotrope, Usinger;   one specimen, Piti,  Nov. 22, at light, Swezey;   one specimeneach,  April 30, Swezeyand Usinger,   May 1,   May 2,   May 26, Piti, Usinger;  pne specimen, Tarague,  May 17, on   Tournefortia[  Messerschmidia], Usinger;   one specimen, Mt. Chachao,  May 16, on   Styphelia, Usinger;   two specimens, Ritidian Point,  June 2, on   Euphorbiahirta, Usinger.  Widely distributed over the islands of the Pacific. China[Ins. Samoa2 (3): 129, 1930] remarks that it "is somewhat variable and is probably composite." Variation is most conspicuous in the form of the anterior lobe of the pronotum. Typical examples from Hawaii vary in this respect but average nearly half as long as broad. The Guamseriesaverages two thirds as long as broad. Series from other islands, especially at the extremes of the range such as Rapa, suggest a Rassenkreisbut the Guamseries does not seem to be sufficiently extreme to warrant a special name at this time.    P. nigricepswas commonest on heliotrope on which eggs were laid on June 23. The eggs were deposited at the tip of a flower head amongthe small flowers. They were placed crosswise to one another and rather loosely in the open but were fastened together and to the flower calyx. They are elongate, slightly curved, about 1 mm. long by 0.35 mm. in diameter. The micropylar end is thicker, subtruncate, while the other end is tapering and rounded at the tip. The chorion is sculptured, exhibiting prominent hexagonal reticulations on the anterior (micropylar) third. Near the middle, these become inconspicuous or appear as slight rugosities. The posterior end is perfectly smooth. The whole surface is glabrous and the egg is almost water white in color. There are five small but very distinct processes forming a small ring on the surface of the micropylar end. The incubation period is six days. 3994028316 [539,1131,955,1001] 1911 D. T. Fullaway Guam Guam 19 30 2 3994028475 sweeping Styphelia 1936-06-03 O. H. Swezey Guam Piti Hills 19 30 9 3994028513 2 miles south of Piti on heliotrope 1936-06-13 R. L. Usinger Guam Piti 19 30 32 3994028438 [775,1611,1060,1103] at light 1936-11-22 O. H. Swezey Guam Piti 19 30 1 3994028321 1936-04-30 O. H. Swezey and R. L. Usinger Guam Piti 19 30 1 3994028454 [1164,1290,1111,1154] 1936-05-01 R. L. Usinger Guam Piti 19 30 1 3994028435 [1310,1436,1111,1154] 1936-05-02 R. L. Usinger Guam Piti 19 30 1 3994028322 [1456,1867,1111,1154] 1936-05-26 R. L. Usinger Guam Piti 19 30 1 3994028358 [478,1867,1161,1206] on Tournefortia (Messerschmidia) 1936-05-17 R. L. Usinger Guam Tarague 19 30 1 3994028478 [477,1578,1212,1255] on Styphelia 1936-05-16 R. L. Usinger Guam Mount Chachao 19 30 1 3994028473 on Euphorbia hirta 1936-06-02 R. L. Usinger Guam Ritidian Point 19 30 2